Answer:
45 becasue it has to be over 43
Step-by-step explanation:
The test score of the student who joined the class will be;
⇒ 55
What is an expression?Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.
Given that;
The mean test score of 12 students = 42
And, A student joins the class and the mean becomes 43.
Now,
Total score for 12 students is,
⇒ x / 12 = 42
⇒ x = 42 × 12
⇒ x = 504
Here, A student joins the class and the mean becomes 43.
Let the student who join = y
So, We get;
⇒ (504 + y) / 13 = 43
⇒ 504 + y = 43× 13
⇒ 504 + y = 559
⇒ y = 559 - 504
⇒ y = 55
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One year, the population of a city was 358,000. Several years later it was 286,400. Find the percent decrease.
A percentage is a way to describe a part of a whole. The percentage decrease is 20%.
What are Percentages?A percentage is a way to describe a part of a whole. such as the fraction ¼ can be described as 0.25 which is equal to 25%.
To convert a fraction to a percentage, convert the fraction to decimal form and then multiply by 100 with the '%' symbol.
One year, the population of a city was 358,000. Several years later it was 286,400. Therefore, the percentage decrease is,
Percentage decrease = (358,000-286,400)/(358,000) × 100% = 20%
Hence, the percentage decrease is 20%.
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martina must choose a number between 49 and 95 that is multiple of 2,8 and 10. write all the numbers that she could choose.
Answer:
80
Step-by-step explanation:
10 limits it to 50, 60, 70, 80, and 90
2 eliminates none since 50=25, 60=30, 70=35, 80=40 and 90=45
8 divided by each number only leaves one option of 80. (80/8= 10) (80/10=8) (80/2=40)
A, B & C lie on a straight line.
BD = CD.
∠BDC = 40° and
∠ADB = 45°.
Work out x
Answer:
25
Step-by-step explanation:
Since triangle DBC is isosceles, angles DBC and DCB must be congruent. Angle BDC is 40 so the sum of the measures of the aforementioned angles must be 180 - 40 = 140; divide that by two and you get that the measure of angle DBC is 70. Angles DBC and ABD are supplementary, as they lie on a straight line, so we can deduce the measure of angle DBA is 180 - 70 = 110. The measure of angle DAB is 180 minus the measures of angle DBA and ADB, we figured out angle DBA is 110 degrees and the problem tells us angle ADB is 45 degrees, so we can subtract to get the measure of angle DAB to be 180 - (110 + 45) = 25.
Answer:
25
Step-by-step explanation:
i dont know how to explain i just know thats the answer hahaha
Answer this for 10 pts pls
Answer:
c and a
Step-by-step explanation:
Answer:
it's both A and C
Step-by-step explanation:
2 x 3/8 is the same as 3/8 + 3/8
What number is missing from this factor tree for the prime factorization of 425?
A. 2
B. 3
C. 5
D. 7
St. augustine grass can grow at the rate of 4 over 7 centimeter per week.
how many weeks will it take the grass to grow 12 over 7 centimeters?
like im gonna need a written answer
explain your answer using words, and show your work using division of fractions.
The weeks will it take the grass to grow 12 over 7 centimeters is 3 weeks.
What is the unitary method?The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.
St. Augustine grass can grow at the rate of 4 over 7 centimeters per week.
The weeks will it take the grass to grow 12 over 7 centimeters
4/7 x = 12/ 7
28x = 84
x = 84/28
x = 3
The weeks will it take the grass to grow 12 over 7 centimeters is 3 weeks.
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Answer:
12/7 divided by 4/7 = 3
Step-by-step explanation:
Write the equation in slope intercept form
y=-3/4x+0
what is y
Answer + Step By Step Explanation:
There is no single value for y as the input could differ (x)
y = -3/4x
if x = 0, y = -3/4(0) than y = 0
if x = 1, y = -3/4(1) than y = -3/4
...
if x = 5, y = -3/4(5) than y = -15/4
Based on the information in the table what is the probability of being a girl and choosing lemonade?
Select one:
a.
21%
b.
.20
c.
20%
d.
38%
e.
.38
Using it's concept, it is found that the probability of being a girl and choosing lemonade is given by:
b. 0.2.
What is a probability?A probability is given by the number of desired outcomes divided by the number of total outcomes.
In this problem, out of 130 people, 26 are girls who choose lemonade, hence the probability is given by:
p = 26/130 = 0.2, which means that option b is correct.
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Which expression represents the number of possible permutations of n items taken r at a time?
Answer: [tex]\frac{n!}{(n-r)!}[/tex]
The exclamation marks indicate factorial.
For instance, 4! = 4*3*2*1 = 24. You start with the given number and multiply your way down to 1.
For more information, check out the nPr permutation formula.
what is lim x→-3 sqrt x^2-8
If the -8 is under the square root, then...
[tex]\displaystyle L = \lim_{x\to -3} \sqrt{x^2-8}\\\\L = \sqrt{(-3)^2-8}\\\\L = \sqrt{9-8}\\\\L = \sqrt{1}\\\\L = 1\\\\[/tex]
OR
If the -8 is not under the square root, then...
[tex]\displaystyle L = \lim_{x\to -3} \sqrt{x^2}-8\\\\L = \sqrt{(-3)^2}-8\\\\L = \sqrt{9}-8\\\\L = 3-8\\\\L = -5[/tex]
Either way, we replace x with -3 and simplify.
For more information, refer to the direct substitution rule for limits.
The limit of [tex]\lim_{x \to \-(-3)} \sqrt{x^{2} -8}[/tex] is one.
What is Limits?A limit is the value that a function approaches as the input approaches some value. Limits are essential to calculus and mathematical analysis, and are used to define continuity.
The given limit is [tex]\lim_{x \to \-(-3)} \sqrt{x^{2} -8}[/tex]
Now replace x with -3 as limit value is -3
√(-3)²-8
Square root over minus three square minus eight
The three square is nine
√9-8
When eight is subtracted from nine we get one.
√1
The square root of one is always one
[tex]\lim_{x \to \-(-3)} \sqrt{x^{2} -8}[/tex]=1
Hence, [tex]\lim_{x \to \-(-3)} \sqrt{x^{2} -8}[/tex] is one.
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Hurry!!!!!!!!!!
the flood levels of some rivers and lakes in arkansas are listed in the table. which lake or river has a flood level that represents the outlier in this data set?
a. ozark
b. dardanelle
c. little rock
d. pine bluff
The lake whose flood level represents an outlier is Ozark.
What is an outlier?
An outlier is a number that is way smaller or way larger than that of other numbers in a data set. The flood level of Ozark is way greater than the other flood levels.
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Find a formula for the sum of the first n even integers : 2 + 4 + 6 + ... + 2n.
Let S be the sum,
S = 2 + 4 + 6 + ... + 2 (n - 2) + 2 (n - 1) + 2n
Reverse the order of terms:
S = 2n + 2 (n - 1) + 2 (n - 2) + ... + 6 + 4 + 2
Add up terms in the same positions, so that twice the sum is
2S = (2n + 2) + (2n + 2) + (2n + 2) + ... + (2n + 2)
or
2S = n (2n + 2)
Divide both sides by 2 to solve for S :
S = n (n + 1)
Solve for x:
e^(3x )+ e^x - 6 = 0
Right now I'm having trouble with the step u = e^x, u^3 + u - 6 = 0. Help!
The value of x of the cubic equation e³ˣ + eˣ - 6 = 0 will be 0.49
What is a cubic equation?The cubic equation is given as ax³ + bx² + cx + d = 0. Then degree of the equation will be 3. Then we have
The cubic equation will be
e³ˣ + eˣ - 6 = 0
Let eˣ = u, then the equation will be
u³ + u - 6 = 0
Then the root of the equation is calculated by the calculator, then we have
u = 1.634, -0.817, -0.817
eˣ = 1.634, -0.817, -0.817
Take log on both sides, then we have
x = ln 1.634, ln(-0.817), ln(-0.817)
x = 0.49, not defined, not defined
Then the value of x will be 0.49.
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What are the exact values of x and y?
x =
y =
Answer:
see the attachment photo!
does someone mind helping me with this problem? Thank you!
Answer:
78
Step-by-step explanation:
= 12 x^2 - 30 put in ' - 3 ' for 'x'
= 12 ( -3 )^2 - 30
= 12 (9) - 30 = 78
Answer:
78
Step-by-step explanation:
Expression:
6(2x² - 5)Evaluate x = 3 according to the question:
[tex]6 \{2 (- 3) {}^{2} - 5) \}[/tex]
Solve this problem, applying PEMDAS.
[tex]6 \{2( - 3 \times - 3) - 5 \}[/tex][tex]6 \{2(9) - 5 \}[/tex][tex]6 \{18 - 5 \}[/tex][tex]6 \{13 \}[/tex][tex]78[/tex]Hence,the answer to the given expression is 78.
-Regards,Hannah :)
What is the surface area of the triangular prism shown?
In a test rn!! A right triangular prism. The height of the prism is 25 centimeters. The sides of the triangular ends have lengths 9 centimeters, 12 centimeters, and 15 centimeters.
86 cm2
1,008 cm2
1,350 cm2
1,080 cm2
The surface area will be equal to option B which is 1008 square centimeters.
What is surface area?The space occupied by any two-dimensional figure in a plane is called the area. The area of the outer surface of any body is called the surface area.
The surface area of the prism will be calculated as:-
SA = area of the three rectangular faces + area of the triangular faces
Area of the rectangular faces = ( 15 X 25 ) + ( 25 X 12 ) + ( 25 X 9 )
= 375 + 300 + 225
= 900 square cm
Area of the triangular [tex]=\sqrt{(s(s-a)(s-b)(s-c)[/tex]
= [tex]\sqrt{(18(18-15)(18-12)(18-9)}[/tex]
= √2916
= 64
Total area of the rectangular face = 2 x 54 = 108
So the total SA area of the prism will be = 900 + 108= 1008 square cm.
Therefore surface area will be equal to option B which is 1008 square centimeters.
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The median is a value in the data set
Answer:
Step-by-step explanation:
The median is defined as the middle value of a data set when all the data is arranged in numerical order.
If there is an even number of values, and therefore no middle value, then the median is calculated as the mean value of the two middle values.
Which Box-and-Whisker Plot below correctly illustrates the data shown below?
{22, 22, 23, 24, 25, 26, 27, 28, 29, 30}
A.
B.
C.
D.
The box-and-whisker plot that illustrates the given data set is shown in the image below (see attachment).
What is a Box-and-Whisker Plot?A box-and-whisker plot consists of the following values of a data set: min, max, lower quartile, median, and upper quartile.
Here, Given the data set,
30, 22, 22, 27, 28, 23, 24, 25, 26, 23
the five-number summary for the box-and-whisker plot would be:
Minimum: 22
Quartile Q1: 22.75
Median: 24.5
Quartile Q3: 27.25
Maximum: 30
Thus, the box-and-whisker plot that illustrates the given data set is shown in the image below (see attachment).
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question 2 help me please
Answer:
90π in²
Step-by-step explanation:
Surface area of cylinder:r = 3 in
h = 10 in
[tex]\sf \boxed{\text{\bf Surface area of cylinder =$\pi r^2h$}}[/tex]
[tex]= \pi 3*3*10\\\\= 90 \pi \ in^2[/tex]
In this question it is given that the radius of a cylinder is 3 inches. The height of the cylinder is 10 inches. We are asked to calculate the surface area of the cylinder in terms of π .
Radius = 3 inches
Height = 10 inches
We know,
[tex] \star \: \small \boxed{\rm{ Surface \: area \: of \: a \: cylinder = πr²h}}[/tex]
Substituting the values we get
[tex] \small\sf{ Surface \: area \: of \: a \: cylinder = π × 3² × 10}[/tex]
[tex] \small\rm{ Surface \: area \: of \: a \: cylinder = π × 3 \times 3 × 10}[/tex]
[tex] \small\rm Surface \: area \: of \: a \: cylinder = π × 90[/tex]
[tex] \small\sf{ Surface \: area \: of \: a \: cylinder = \bf{90 π \: inches²}}[/tex]
The average cost of regular gasoline per gallon in 2014 was $3.34. In 2015 it decreased $0.94 per gallon in 2016 it decreased another $0.27 per gallon. The average cost increased.36 per gallon in 2017 what was the average cost per gallon at the end of 2017
Let's calculate the surface of the ABC triangle from the image if the area of the triangle DBC is 40 square unit,| BC| = 8i| AB| = 14. Corners marked in the image are compliant.
ANSWER: 122.5 square
Answer:
122.5 squared
Step-by-step explanation:
bahh have have aheve shaved she sbdnabd sjsbd akdbd
PLEASE HELP ILL MAKE YOU THE BRAINIEST!!
Find the area of the shaded segment of the circle
Answer:
Exact Area =
16pi - 32 square meters
Decimal Approx:
A = 18.3 sq m
Step-by-step explanation:
In degrees, it's 360° all the way around a circle. The 270° in the image is to show you that the small piece (the triangle and yellow segment) are in a 90° part of the circle. That is 1/4 of the circle, this helps with area two ways. We'll find 1/4 of the circle area and also, that makes the triangle base 8 and height 8. This helps us find triangle area. See image.
If the measure of arc AB is 50 degrees, what is the measure of angle ADB?
90 degrees
100 degrees
25 degrees
50 degrees
Answer:
25 degrees
Step-by-step explanation:
arc divided by 2 = angle
50/2=25
What is the correct way to write 0.000000056
meter in scientific notation?
Answer:
[tex]5.6 \times 10^{-8}~ m[/tex]
Step-by-step explanation:
[tex]0.000000056\\\\=\dfrac{56}{1000000000}\\\\\\=\dfrac{56}{10^9}\\\\\\=56 \times 10^{-9}\\\\\\=56 \times 10^{-1} \times 10^{-8}\\\\\\=5.6 \times 10^{-8}~[/tex]
PLSSS HELP IF YOU TURLY KNOW THISS
Answer:
0.1
Step-by-step explanation:
You are adding on 0.1 for each line and since G is the first line after 0, it is 0.1.
I need help to simplify this expression
Answer:
[tex]a^{7} +b^{6}[/tex]
Hope this helps :)
What is the value of x in the equation three-fifths x = negative 45? –75 –27 27 75
Answer:
x = -75
Step-by-step explanation:
[tex]\frac{3}{5}[/tex] x = - 45 ( multiply both sides by 5 to clear the fraction )
3x = - 225 ( divide both sides by 3 )
x = - 75
Answer:
A
Step-by-step explanation:
Write the following inequality in slope-intercept form. 5x-5y>70
The given inequality 5x - 5y > 70 when written in Slope intercept form is gotten as; y < x + (-14)
How to write slope intercept form?The formula for equation of a line in slope intercept form is given by;
y = mx + c
where;
m is slope
c is y-intercept
We are given the inequality as;
5x - 5y > 70
Thus;
Subtract 5x from both sides to get;
-5y > 70 - 5x
divide both sides by -5 to get
y < x + (-14)
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Create a frequency distribution table for each of the following.
1.The heights in centimeters of twenty students are given below.
Construct a frequency table for the data.
The frequency of the data sets is defined as the number of times the data is repeated in the given dataset. The frequency of the given data is calculated in the table below.
What is the frequency of the data sets?The frequency of the data sets is defined as the number of times the data is repeated in the given dataset.
Height (cm) Frequency
146 -- 2
147 -- 1
148 -- 1
149 -- 1
150 -- 2
151 -- 1
152 -- 6
153 -- 2
154 -- 3
155 -- 1
As we can see that the height of 146 cm is repeated two times so its frequency is 2. From this concept, all the frequencies are calculated above.
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A plane is located at C on the diagram. There are two towers located at A and B. The distance between the towers is 7,600 feet, and the angles of elevation are given.
a. Find BC, the distance from Tower 2 to the plane, to the nearest foot.
b. Find CD, the height of the plane from the ground, to the nearest foot.
Please show work!
Answer:
part 1) BC is 17491 ft
part 2) CD is 6499 ft
Step-by-step explanation:
Answer:
part 1) BC is 17491 ft
part 2) CD is 6499 ft