Step-by-step explanation:
A circle with a center of (-1,2) and a radius
of
[tex]2 \sqrt{2} [/tex]
John asks why the last step of Pólya's four-step problem solving process, looking back, is necessary since he has already given the answer. What can you tell him?
Select all the possible reasons the last step, looking back, is necessary below.
A. Looking back allows a student to check that the answer is correct.
B. Looking back allows a student to determine the best strategy to find the solution.
C. Looking back allows a student to understand the problem.
D. Looking back allows a student to check that the answer makes sense in context of the problem.
The reason why looking back is important in mathematical answers is that; Option D: Looking back allows a student to check that the answer is correct and makes sense in context of the problem.
How to confirm mathematical answers?We know that in mathematics, every problem has steps to solve it whether algebra, proportion, trigonometry, calculus, congruency, angles, logarithms, e,t,c
Now, since we know that every Maths problem has steps to solve them, then we can say that, in some instances, we definitely have to look back to be sure that the answer actually makes sense when we consider the solution being required.
Now, if we have to look back to check that the answer is actually correct and properly portrays the solution being demanded, then we can say that the appropriate option for looking back her is option D.
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Find the volume of the solid. When appropriate, use 3.14 and round to the nearest hundredth.
Answer:
904.32 cm³
Step-by-step explanation:
Assuming 12cm is the diameter.
The given solid is a sphere, we must find the volume.
Given radius:
[tex]6[/tex]6
Use the equation [tex]v=\frac{4}{3} \pi r^3[/tex] to find the volume of the sphere.
[tex]\frac{4}{3} \times\pi\times6^3[/tex]
≈ 904.77868
Rounding, 904.32 cm³
susan can type 4 pages of text in 10 minutes. assuming she types at a constant rate, write the linear equation that represents the situation.
Assuming that Susan types at a constant rate, the situation can be represented as a linear equation as:
n = 0.4t, where n represents the number of pages that Susan can type and t represents time in minutes in which Susan would type.
Number of pages Susan can type in 10 minutes = 4
The number of pages that Susan can type in 1 minute
= 4/10 = 0.4
Therefore, the number of pages that Susan can type in t minutes
= 0.4 × t = 0.4t
Hence, this can be represented in the form of a linear equation as
n = 0.4t
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Christian went into a movie theater and bought 8 drinks and 10 candies, costing a total of $94. Dianelys went into the same movie theater and bought 9 drinks and 6 candies, costing a total of $79.50. Write a system of equations that could be used to determine the price of each drink and the price of each candy. Define the variables that you use to write the system.
The cost of each drink is $5.5
The cost of each candy is $5
What is elimination method ?Using the elimination method, you may either add or subtract the equations to produce an equation in one variable. To eliminate a variable, add the equations when the coefficients of one variable are in opposition, and subtract the equations when the coefficients of one variable are in equality.
According to the given information
Let number of drinks = x
Let number of candies = y
Christian bought 8 drinks and 10 candies and it costed $94
So the equation becomes
8x + 10 y = $94
Other guy bought 9 drinks and 6 candies and it costed $79.50
So the equation becomes
9x + 6y = $79.50
By applying elimination method
9x + 6y = $79.50
Dividing by 2
3x + 2y = $26.5
multiplying the above equation by 5
15x + 10y = $132.5
8x + 10 y = $94
Subtract the following equation
7x = 38.5
x = 5.5
substituting the value of x in above one equation we get
y = 5
So the cost of each drink is $5.5
the cost of each candy is $5
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Answer:
D = the price of each drink
C = The price of each candy
One drink costs d. So 8 drinks cost 8d. Same thing with candies except a different variable. One candy costs c. Therefore 10 candies cost 10c. So the first equation here would be :
8d + 10c = 94
Same thing with the second equation but with different numbers :
9d + 6c = 79.50
If you're also looking for a solution to this answer. You use a process called the elimination method.
Let me know if you have any questions ! <3
i have no idea how to do this can anyone help
The end behavior of the functions is obtained considering the limits of the functions as the input variable x goes to infinity.
For limits when x goes to infinity, only the term with the highest exponent of each of the numerator and of the denominator is considered, hence the functions are written as follows:
f(x) = x²/x³.g(x) = x³/x³.h(x) = x^4/x³.Applying the exponent properties, the equivalent expressions are given as the base x elevated to the subtraction of the exponents 2 and 3, hence:
f(x) = 1/x.g(x) = 1.h(x) = x.Which is how the functions behave as x goes to infinity.
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please help, im sick and im having a mental breakdown right now.
Answer:
Step-by-step explanation:
SORRY CANT HELP YOU I AM ONLY IN 4 GRADE SO SORRY
An automobile uses 17 gal of fuel to go 570 mi. how many gallons are required to travel 890 mi? (round your answer to one decimal place.)
The automobile needs 26.5 gallons of gas to reach 890 miles.
What is a unitary method?A unitary method is a mathematical way of obtaining the value of a single unit and then deriving any no. of given units by multiplying it with the single unit.
Given, An automobile uses 17 gallons of fuel to go 570 mi.
∴ The automobile requires (17/570) gallons of gas to reach 1 mile.
∴ To reach 890 miles the automobile needs (17/570)×890.
= 26.5 gallons of gas.
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A standard queen bed hotel room at the Posh Inn is currently priced at $ 135 a day, after a 17 % markup to offset inflation costs. What was the daily charge for the room before the increase?
the regular daily charge is "x", oddly enough that's the 100%.
so the new charge is 17% up, that means the new charge is 100% + 17% = 117%, and we know that's $135, so
[tex]\begin{array}{ccll} amount&\%\\ \cline{1-2} x & 100\\ 135& 117 \end{array} \implies \cfrac{x}{135}~~=~~\cfrac{100}{117} \\\\\\ 117x=13500\implies x=\cfrac{13500}{117}\implies x=\cfrac{1500}{13}\implies x=115\frac{5}{13}[/tex]
Identity the slope and y intercept of the graph then write the equation in slope intercept form
Answer:
m = -4
b =1
y = -4x+1
Step-by-step explanation:
We want to find the slope and y intercept
Given the two points ( -1,5) and ( 1,-3), we can use the slope formula
m = ( y2-y1)/(x2-x1)
= ( -3 -5)/( 1 - -1)
= -8/( 1+1)
= -8/2
= -4
The y intercept is where it crosses the y axis
It crosses at 1
The slope intercept form of the line is
y = mx+b
y = -4x+1
Kara, Sammy, Liz, and Mark each took many samples from the same population of students. The number of students in each sample is shown in the table. Which person’s sampling distribution was most likely to closely approximate the population distribution. Kara: 83 | Sammy: 14 | Liz: 46 | Mark: 65
Answer:
B. Sammy
Step-by-step explanation:
Kara, Sammy, Liz and Mark each took many samples from the same population of students. But the number of students in the Sammy's sample is largest, hence their mean will have lest variation.
The length of a rectangle is 2 ft more than twice the width. The area is 84 ft2. Find the length and width of the rectangle.
Lenght
Width
Answer:
let width=x
length = x + 2ft
Area = 82ft^2
Area= length×width
=(x+2)x
=x^2 +2x=82
x^2+2x-82=0
Use Quadratic Equation to get x.
x = -10.1(reject, length cannot be minus value or 8.11)
x = 8.11
width = 8.11ft
length = 10.11ft
Solve for m. -2m-4m-17=1 m=
m = -[tex]\frac{17}{7}[/tex]
Step-by-step explanation:Here are the steps to figuring out your problem:1. Combine like terms
-2m - 4m - 17 = 1m
-6m - 17 = 1m
2. Multiply by 1
-6m - 17 = 1m
-6m - 17 = m
3. Add 17 to both sides
-6m - 17 = m
-6m - 17 + 17 = m + 17
4. Simplify
Add the numbers:
-6m - 17 + 17 = m + 17
-6m = m + 17
5. Subtract m from both sides
-6m = m + 17
-6m - m = m + 17 - m
6. Simplify
Combine like terms:
-6m - m = m + 17 - m
-7m = m + 17 - m
Combine like terms:
-7m = m + 17 - m
-7m = 17
7. Divide both sides by the same factor
-7m = 17
[tex]\frac{-7m}{-7}[/tex] = [tex]\frac{17}{-7}[/tex]
8. Simplify
Cancel terms that are in both the numerator and denominator:
[tex]\frac{-7m}{-7}[/tex] = [tex]\frac{17}{-7}[/tex]
m = [tex]\frac{17}{-7}[/tex]
Divide the numbers:
m = -[tex]\frac{17}{7}[/tex]
Solution:m = -[tex]\frac{17}{7}[/tex]
I hope my answer helped you! If you need more information or help, comment down below and I will be sure to respond if I am online. Have a wonderful rest of your day!
With the recent launch of Artemis there has been a new initiative to send manned missions to the Moon in hopes of one day colonizing it. The newly founded International Space Agency has decided to select one lucky person from the general population to join this venture. Instead of choosing people at random, however, they decide to administer a 50-question multiple-choice test to everyone who applies. Each question has only two choices (A or B) and only one correct answer. Answer the questions below and explain the steps you used to arrive at your answers (e.g., give calculations when applicable):
a) What is the probability that random guessing will lead to a passing (70% or higher) score?
b) Imagine that the Agency decided that 50 questions was too difficult and shortened the test to just 25 questions. To balance this out, they also changed the questions so they each have four options (A, B, C, and D), but still only one possible correct answer. What is the probability that random guessing will lead to a perfect score?
c) Based on the results, do you think the first or second version of the test is safer against examinees guessing to achieve a passing score? Explain your answer.
a) The probability that random guessing will lead to a passing score is of: 0%.
b) The probability that random guessing will lead to a perfect score is of: 3.35 x 10^-18.
c) The first version of the test is safer against examinees guessing to achieve a passing score.
What is the binomial distribution formula?The mass probability formula, giving the probability of x successes, is presented as follows:
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]
The parameters are given by:
n is the number of trials of the experiment.p is the probability of a success on a single trial of the experiment.For item a, considering that for 50 questions, all are guessed among five answer, the values of these parameters are given as follows:
n = 50, p = 1/5 = 0.2.
The probability of passing is given as follows:
P(X ≥ 35).
Using a binomial distribution calculator, with the given parameters, we have that:
P(X ≥ 35) = 0%.
For item b, the parameters are given as follows:
n = 25, p = 1/4 = 0.2.
Hence the probability of a perfect score is given as follows:
P(X = 25) = 0.2^25 = 3.35 x 10^-18.
For item c, we have that the first version is safer against examinees guessing to achieve a passing score, as:
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The coordinates of the vertices of a rectangle are given by R(- 3, - 4), E(- 3, 4), C (4, 4), and T (4, - 4). Plot these points on the coordinate plane at the right and connect them to draw the rectangle. Then connect points E and T to form diagonal _ET . a. Use the Pythagorean Theorem to find the exact length of _ET . b. How can you use the Distance Formula to find the length of _ET ? Show that the Distance Formula gives the same answer.
Answer:
By Pythagorean theorem: [tex]ET=\sqrt{113}[/tex]
By distance formula: [tex]ET=\sqrt{113}[/tex]
Step-by-step explanation:
The given rectangle has vertices R(-3,-4), E(-3, 4), C(4,4), and T(4-4).
The points have been plotted on the coordinate plane as shown in the attachment.
A. Using the Pythagoras Theorem;
[tex]ET^2=EC^2+CT^2[/tex]
We substitute the side lengths to obtain:
[tex]ET^2=EC+CT^2[/tex]
[tex]ET^2=49+64[/tex]
[tex]ET^2=113[/tex]
Take positive square root to obtain:
[tex]ET=\sqrt{113}[/tex]
B. The distance formula is given by:
[tex]d=\sqrt{(x_{2}-x_{1)^2+(y_{2}- y_{1} )[/tex]
The endpoints of ET are at E(-3,4) and T(4,-4).
Using the distance formula;
[tex]ET=\sqrt{4--3)^2+(-4-4)^2}[/tex]
[tex]ET=\sqrt{(7)^2} +(-8)^2[/tex]
[tex]ET=\sqrt{49+64}[/tex]
[tex]ET=\sqrt{113}[/tex]
The following information matrices shows how many of each Video Game Consoles that each
electronics store sold during one weekend and the price that is charged for each gaming console at all
3 stores.
Micro Middle store sold the least number of video game consoles.
What is a 2D matrix?The two dimensions of a matrix are represented by rows and columns. The row index and the column index are the two subscripts that each element is specified by.
The rows and columns in a matrix stand in for the two dimensions. The row index and the column index serve as two subscripts that each define an element. A 2D matrix is expanded into a multidimensional array, which uses additional subscripts for indexing.
The total no. of consoles sold by each store is:
Game Go = 53+21+48 = 122
Better Buy = 65+34+70 = 169
Micro Middle = 18+11+15 = 44
The least number of consoles were sold by Micro Middle(44).
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Which of the following graphs shows a dilation of the triangle from a fixed point?
The graph that shows a dilation among the given graphs is; Graph F.
What is dilation?Dilation in graphs simply means each side is multiplied by the same
scale factor. What this means is that the ratio of each dilated side to their respective old sides before dilation must be the same scale factor.
We can see that the pre-dilated image has 2 units along the y - axis and 4 units across the x-axis. After dilation, it now has 4 units along the y - axis and 8 units across the x-axis. This means the scale factor in both axis are; 4/2 = 2 and 8/4 = 2. They are both the same scale factors and as such this graph shows a dilation.
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Use the image below to answer the next two questions.
ABCD pictured below is a square.
Categorize the angles as either 45° or 90°.
The measure of angle ABC is 90° and the the measure of angle BDC is 45°.
Square ABCD is given.
What is a square?A square is a quadrilateral with four equal sides. There are many objects around us that are in the shape of a square. Each square shape is identified by its equal sides and its interior angles that are equal to 90°.
Diagonals bisects the angles in square and intersect each other at right angle.
Now, ∠ABC=90°
∠AED=90°
∠BAC=45°
∠DBC=45°
∠BDC=45°
Hence, the measure of angle ABC is 90° and the the measure of angle BDC is 45°.
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simplify the expression: 5(1+2m)
Answer:
Hi!
The answer would be: 5 + 10m
I hope this helped you! :)
Answer:
[tex]\bf 5+10m[/tex]
Step-by-step explanation:
[tex]\bf 5\left(1+2m\right)[/tex]
Apply the distributive law:-
[tex]\bf 5\left(1+2m\right)=5\times \:1+5\times\:2m[/tex]
[tex]\bf 5\times\:1+5\times \:2m[/tex]
[tex]\bf 5+10m[/tex]
___________________
Hope this helps!
Have a good one!
wn measures (Example 1)
B 8 in.
2.
85%
12 in.
A 35°
14 in.
60°
C
Z
42 in.
t
S
Y
36 in.
Answer:
The answer is A
Step-by-step explanation:
took the test.
The chart shows the average time spent reading per day for students in an 8th grade class.
The line plot is titled minutes of reading per day, and the horizontal axis is labeled minutes of reading per day. There are 5 dots at 30, 1 dot at 33, 5 dots at 35, 1 dot at 36, 1 dot at 37, 3 dots at 40, 1 dot at 44, one dot at 46, 1 dot at 47, and 1 dot at 50.
Which of the following describes this data set?
Categorical and bivariate
Categorical and univariate
Numerical and bivariate
Numerical and univariate
This data collection may be characterized as numerical and univariate.
How do you define numerical and univariate?If the collection of all potential values for a numerical univariate data is finite or countably infinite, the data is discrete. Usually, discrete univariate data are used in counting (such as the number of books read by a person). If the range of all potential values is a set of numbers, then a numerical univariate data is continuous.
Categorical data – what is it?Categorical variables represent different sorts of data that may be categorized. Race, sex, age group, and educational level are some examples of categorical variables.
Data types that may be kept and recognized based on the names or labels assigned to them are referred to as categorical data. Numerical data refers to the data that is in the form of numbers, and not in any language or descriptive form. Also known as qualitative data as it qualifies data before classifying it.
Over here we have the data for the average time spent reading per day for students in an 8th grade class.
Average Time is a numerical data
Bivariate data deals with two variables
univariate data, which is one variable data
we have numerical data and one variables so its
Numerical and univariate
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The lengths of the legs of an isosceles right triangle are x and [tex]\sqrt{6x+16}[/tex]
a. Find the length of the hypotenuse, in terms of x, in simplest radical form
b. Find the length of all three sides of the triangle, in simplest radical form.
Check the picture below. Let's recall is an isosceles, so it has twin sides and is a right-triangle.
[tex]x^2+(\sqrt{6x+16})^2\implies \sqrt{x^2+6x+16}\qquad \impliedby hypotenuse \\\\[-0.35em] ~\dotfill\\\\ x~~ = ~~\sqrt{6x+16}\implies \stackrel{\textit{squaring both sides}}{x^2=6x+16}\implies x^2-6x-16=0 \\\\\\ (x-8)(x+2)=0\implies x= \begin{cases} 8 ~~ \textit{\LARGE \checkmark}\\\\ -2 ~~ \bigotimes \end{cases} \\\\[-0.35em] ~\dotfill[/tex]
[tex]\underset{\textit{length of each side}}{\stackrel{\sqrt{(8)^2 + 6(8) + 16}}{{\Large \begin{array}{llll} 8\sqrt{2} \end{array}}}\hspace{5em}\stackrel{x}{\text{\Large 8}}\hspace{5em}\stackrel{\sqrt{6(8) - 16}}{\text{\Large 8}}}[/tex]
now, let's notice, the negative value is a legitimate value, however for this case is invalid since the lengths of the triangle can't be negative.
Bill jumps off a diving board that is 12 feet above the surface of a swimming pool. Jumping upward and outward, he reaches a maximum height of 18 feet above the surface of the water when he has jumped outward 4 feet. Find f(x) an equation for his parabolic path and when he hits the water, how far out has he reached, to to the nearest tenth of a foot.
The f(x) = -ax²+18 function equation for his parabolic path. x=√8 is he reached, to the nearest tenth of a foot.
What does "function equation" actually mean?A function is an equation that has just one answer for y for every possible value of x. When utilizing a function, each input of a certain type receives exactly one output.
Briefing:f(x) = -ax² + 18
f(2)= -a(2)²+18 = 12
-4a = 12-18
-4a = -6
a = -6/-4
a = 3/2
f(x) = (-3/2) x² + 12
f(0) = (-3/2) x² + 12
(3/2) x² = 12
x² = 8
x = √8
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Every day, Aubrey's orange juice stand uses 2 bags of oranges. How many days will 4/5
of a bag of oranges last?
Answer:
please download the attached file and let me know if you need any further information about addmition in roots international and if so how to make food with clay
Step-by-step explanation:
ok inshallah and a have of safe Earth’s warm and and
[tex]85(94 + 611) < 64(85 - 54)[/tex]
it same like before the end
Answer: 2/5 days
Step-by-step explanation:
4 / 5 = 2d
4 / 10 = d
2 / 5 = d
Given BC ║ AD and BC ≅ AD
Proof m∠ BAC ≅ m∠ DCA
What is parallelogram side theorem?
The parallelogram side theorem simply means that the opposite sides of a parallelogram are equal and also parallel to each other.
Proof: We have AD || BC [Opposite sides of parallelogram ABCD]
∠BAC= ∠ACD …(i) [Alternate angles with transversal AC]
Now, AB || CD [Opposite sides of parallelogram ABCD]
∠DAC = ∠ACB …(ii) [Alternate angles with transversal AC]
In ΔABC and ΔACD, we have
∠1 = ∠3 [From (i)]
∠2 = ∠4 [From (ii)]
and AC = CA [Common]
∴ ΔABC≅ ΔCDA [By ASA Congruence]
Hence Proved.
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ΔABC≅ ΔCDA By ASA Congruence, therefore m∠ BAC ≅ m∠ DCA, hence proved using parallelogram side theorem.
What is parallelogram side theorem?
The parallelogram side theorem simply means that the opposite sides of a parallelogram are equal and also parallel to each other.
Proof: We have AD || BC [Opposite sides of parallelogram ABCD]
∠BAC= ∠ACD …(i) [Alternate angles with transversal AC]
Now, AB || CD [Opposite sides of parallelogram ABCD]
∠DAC = ∠ACB …(ii) [Alternate angles with transversal AC]
In ΔABC and ΔACD, we have
∠1 = ∠3 [From (i)]
∠2 = ∠4 [From (ii)]
and AC = CA [Common]
∴ ΔABC≅ ΔCDA [By ASA Congruence]
Hence Proved.
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A quality inspector visits two factories. She measures statistics for the mass of screwa produced at each factory.
- The screws from which factory have grealer mass?
Overall, the screws from Factory A have greater mass.
- Find the difference in means between the factories:
25.1-24.9=0.2
Find the ratio of the difference in means to the MAD of Factory A: 0.2/0.2=1 Find the ratio of the difference in means to the MAD of Factory B: 02/0.3}=0.67 Are the screws produced by the two factories substantially different?
The required percentage is 95% data lies between the given data.
What is percentage?
A figure or ratio that may be stated as a fraction of 100 is a percentage. If we need to calculate a percentage of a number, we should divide it by its entirety and then multiply it by 100. The proportion therefore refers to a component per hundred. Per 100 is what the word percent means. The letter "%" stands for it.Let X be the lengths of screws.
X~ Normal (μ = 5.5, σ = 0.1)
P[5.3 < X < 5.7]
= P[(5.3-5.5)/0.1 < (X-μ)/σ < (5.7-5.5)/0.1]
= P[-2 < Z < 2] Z is a standard normal variable.
= 2*P[Z < 2] - 1
= 2*0.97725 - 1, from standard normal table.
= 0.9545
P[5.3 < X < 5.7] = 0.95
Hence, the required percentage is 95% data lies between the given data.
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What linear equation does each graph represent?
Draw an equation into each box to match the graph with its equation.
The linear equation each graph is y = (1/5)x +3, y = 2x, y = -3x+5 and y = (1/3)x +5 respectively
How to determine what linear equation each graph represents?The equation of a line is of the form y = mx+c
Where m is the slope and c is the y-intercept
Graph 1
c = 3
m = 1/5 = 0.2
y = mx+c
Thus, the linear equation is y = (1/5)x + 3 or y = 0.2x + 3
Graph 2
c = 0
m = 2/1 = 2
y = mx+c
Thus, the linear equation is y = 2x+0 or y = 2x
Graph 3
c = 5
m = -3/1 = -3
y = mx+c
Thus, the linear equation is y = -3x+5
Graph 4
c = 5
m = 1/3 = 1/3
y = mx+c
Thus, the linear equation is y = (1/3)x+5 or y = 0.33x+5
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In a manufacturing process, a random sample of 36 bolts has a mean length of 3 inches with a standard deviation of .3 inches. What is the 99 percent confidence interval for the true mean length of the bolt?
The 99 percent confidence interval for the true mean length of the bolt is CI = (2.8712, 3.1288)
How to find the confidence interval?Confidence Interval is used to tell us the degree of certainty or uncertainty that is existent in a sampling method.
The general formula for confidence interval is;
CI = x' ± z(s/√n)
where;
x' is sample mean
z is z-score at confidence level
s is sample standard deviation
n is sample size
We are given;
sample size; n = 36
Sample mean; x' = 3 inches
standard deviation; s = 0.3 inches
confidence level = 99%
z at 99% CL = 2.576
Thus;
CI = 3 ± 2.576(0.3/√36)
CI = 3 ± 0.1288
CI = (2.8712, 3.1288)
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Find the measure of the reference angle for a -319° angle.
The measure of the reference angle for the angle A = -319° is 41°
What is Reference Angle?
Every angle is measured from the positive part of the x-axis to its terminal line (the line that determines the end of the angle) traveling counterclockwise. For angles in the first quadrant, i.e., angles less than or equal to 90 degrees, the reference angle is equal to the original angle.
The reference angle is always positive
0° to 90°: reference angle = angle
90° to 180°: reference angle = 180° - angle
180° to 270°: reference angle = angle - 180°
270° to 360°: reference angle = 360° - angle
Given data ,
Let the reference angle be = R
Let the angle be represented as A
Now , the value of A is = -319°
And , The reference angle is always positive
So , the value of A = 319°
So , the angle lies in the first quadrant
Now , the reference angle is calculated by
R = 360° - A
Now , the value of the reference angle R = 360° - 319°
The value of R = 41°
Therefore, the value of R = 41°
Hence , The measure of the reference angle for the angle A = -319° is 41°
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27 students are learning to make ballon animals. There are 172 ballooons to be shared equally among the students.
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