The researchers use inferential statistics.
Inferential statistics uses measurement from a sample, comparing groups and making generalizations about the large population. Inferential statistics are based on a test statistic calculated based on a formula. The test statistic along with degrees of freedom to determine the difference between the study population. With inferential statistics, the researcher will draw conclusions from extrapolations.
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There is a close relationship between the air pressure inside a hurricane and its maximum
sustained wind speed: y = -0.932x + 973 where x is the air pressure in millibars (kPa) and y is the
wind speed in knots (nautical miles per hour).
The wind speed when the air pressure is 20kpa will be 954.36 miles per hour.
How to illustrate the information?From the information, there is a close relationship between the air pressure inside a hurricane and its maximum sustained wind speed: y = -0.932x + 973.
where x = the air pressure in millibars (kPa) l
y = wind speed in knots (nautical miles per hour).
Therefore, the wind speed when the air pressure is 20kpa will be calculated thus:
y = -0.932x + 973.
y = -0.932(20) + 973.
y = -18.64 + 973
y = 954.36
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There is a close relationship between the air pressure inside a hurricane and its maximum
sustained wind speed: y = -0.932x + 973 where x is the air pressure in millibars (kPa) and y is the
wind speed in knots (nautical miles per hour). Find the wind speed when the air pressure is 20kpa.
You want to hang three equally-suzed travel posters on a wall so that posters on the ends are each 3 feet from the end of the wall. You want the sapacing between posters to be equal. Wrte and somve an equation to determine how much space you should leave between the posters.
The equation is:
You Should leave ______ feet of space.
plss help me
Answer:
[tex]\frac{15-6-6}{2}[/tex] = x
You should have 1.5 feet of space between each picture.
Step-by-step explanation:
Let x be the spacing between the pictures
[tex]\frac{15-6-6}{2}[/tex] = x The total length - end spacing - the width of the posters. What is left is the blank spaces between the posters. Since there are 2 blank spaces, we will divide by 2 to find out the spacing between the two pictures. Which is 1.5 feet.
Given the piecewise function shown below, select all of the statements that are true. (includes pic)
thanks
Answer:
A and C
Step-by-step explanation:
Piecewise functions have multiple pieces of curves/lines where each piece corresponds to its definition over an interval.
Given piecewise function:
[tex]f(x)=\begin{cases}2x \quad &\text{if }x < 1\\5 \quad &\text{if }x=1\\x^2 \quad &\text{if }x > 1\end{cases}[/tex]
Therefore, the function has three definitions:
[tex]\textsf{If $x$ is less than $1$ then $f(x) = 2x$}.[/tex][tex]\textsf{If $x$ equals $1$ then $f(x) = 5$}.[/tex][tex]\textsf{If $x$ is greater than $1$ then $f(x) = x^2$}.[/tex][tex]\textsf{A.} \quad f(1) =5[/tex]
This statement is true as when x = 1, f(x) = 5.
[tex]\textsf{B.} \quad f(5)=1[/tex]
This statement is false as when x is greater than 1, f(x) = x²:
[tex]\implies f(5)=(5)^2=25[/tex]
[tex]\textsf{C.} \quad f(2)=4[/tex]
This statement is true as when x is greater than 1, f(x) = x²:
[tex]\implies f(2)=(2)^2=4[/tex]
[tex]\textsf{D.} \quad f(-2)=4[/tex]
This statement is false as when x is less than 1, f(x) = 2x:
[tex]\implies f(-2)=2(-2)=-4[/tex]
A woman decides to start a small business making monogrammed cocktail napkins. She can set aside $1870 for monthly costs. Fixed costs are $1329.50 per month and variable costs are $3.70 per set of napkins. How many sets of napkins can she afford to make per month?
[tex] \: \huge \tt{\pink{A}{\orange{N}S{\green{W}{\blue{E}{\purple{R}}}}}} \\ \\ \: \: \: \tt \rightarrow {\blue{\fbox{147 \: sets}}} (approx)[/tex]
Step-by-step explanation:
Fixed costs = $ 1329.50 per month
Variable cost are $3.70 per set of napkins
Total cost she set aside = $1870 for monthly costs
Amount left for napkins = Total cost - Fixed Cost
= 1870 - 1329.50
= $540.50
$540.50 she can spend on napkinsCost for one set = $3.70
Let set of napkins = x
Total cost for napkins = $540.50
x × 3.7 = 540.50 x = 540.50 / 3.70x = 146.08 (approx) or 147 setsTherefore , she can afford to make 147 (approx) sets of napkins per month.
Q20. in an assorted colored lego box, 5/6 of the legos were red, and 2/3 of the remaining legos were green. if there were 18 legos, how many of the legos were green?
Answer:
2 legos were green
Step-by-step explanation:
Given- in an assorted colored lego box, 5/6 of the legos were red, and 2/3 of the remaining legos were green. if there were 18 legos,
let->
x number of the red ball then probability= x/18=5/6
=>x=15
then, 3 balls are other in which the green +remaining ball is present according to the question.
2/3 times of 3 are green legos==>
(2/3)*3=2 are green legos;
and the last ball 1 lego is remain.
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Henry and his friend were buying trick decks from the magic shop for
eight dollars each. How much did they spend if Henry bought five decks
and his friend bought five decks?
Answer:
Henry bought five decks
so that is 8*5 dollars
which is 40dollars
and his friend to bought the same amount so 40 +40 is 80dollars
. What values of x will make the absolute value equation, 2x - 4= 15, true?
After factorization, the absolute value of the variable 'x' is 9.
What is factorization method?
The factorization method is used for the quadratic based equation whose highest degree is either two or more than two. Depending upon the degree of the variable, the number of factors are calculated. And by substituting the calculated value to check whether the answer is correct or not.
According to the question, the given linear equation is: |2x - 4| = 15
Now, to calculate the value of the variable 'x' by using factorization method. And to remove the bars which represent absolute value that means positive values
Required expression: |2x - 4| = 15
⇒ 2x = 15 + 4 = 19
⇒ x = 19/2 = 9.5
After factorization, the absolute value of the variable 'x' is 9.
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write 5 to the power of -3 in its simplest form without any indices
lol this is annoying
5 to the power of -3 in its simplest form without any indices is 1/125 or 0.008.
Exponents
Exponent is defined as the method of expressing large numbers in terms of powers. That means, exponent refers to how many times a number multiplied by itself. For example, 6 is multiplied by itself 4 times, i.e. 6 × 6 × 6 × 6. This can be written as [tex]6^4[/tex]. Here, 4 is the exponent and 6 is the base. This can be read as 6 is raised to power 4.
We know that,
[tex]a^{-b}=\frac{1}{a^b}[/tex]
Hence, we can write,
[tex]5^{-3}=\frac{1}{5^3}[/tex]
We know that the cube of 5 is 125.
Hence, we can write,
[tex]\frac{1}{5^3}[/tex] = 1/125
1/125 is the simplest form of fraction and is equal to 0.008 in decimal form.
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write an equation for the line will give brainliest
The equation of the line graph in slope intercept form is gotten as;
y = x + 3
What is the equation of the Line in Slope Intercept Form?The general formula for the equation of a line in slope intercept form is;
y = mx + c
where;
m is slope
c is y-intercept
Now, from the given straight line equation graph, we can see that the line crosses the x-intercept at x = -3 and crosses the y-intercept at y = 3. Thus;
When x = 0, y = 3
When y = 0, x = -3
Slope is gotten by using two points and their coordinates to get;
m = (3 - 0)/(0 - (-3))
m = 3/3
m = 1
Thus, the equation of the line is y = x + 3
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john and maria are on the game show, "minute to win it" some of the numbers have slipped off the number line. help john and maria place the rational numbers back on the number line below.
\sqrt{16}
2/3
|-3|
2.47 x 10^{-2}
-1/4
The rational numbers arranged on a number line will graduate from the highest to the lowest (left to right) as follows:
√16|-3|2/32.47x10⁻²-1/4What is a rational number?A rational number is defined in mathematics as the quotient or fraction p/q of two integers, a numerator p, and a non-zero denominator q. For example, −4/7 is a rational number, as is every integer.
Note that a number line is defined as a horizontal line with evenly spaced numerical increments.
To get the order in which the numbers must be arranged, the trick is to convert the number for which you have doubt into their decimal forms or d integer forms.
A) √16 = 4
B) 2/3 = 0.6
C) |-3| = 3 {Reason: Absolute Value of any number must be its positive equivalent]
D) 2.47 x 10^{-2} = 0.0247
E) -1/4 = -0.25
Hence rearranged in descending order (from highest to lowest) we have:
On the number line, the first nubmer from the left will be √16, followed by |-3|, and so on.
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The Sum of the first 21 terms of the progression, -18, -15,-12........ is _____
Answer:
3
Step-by-step explanation:
18,15,12,..........
S
n
=45=
2
n
[2a+(n−1)d]
=>
2
n
[2×18+(n−1)(−3)]=45
=>
2
n
[36−3n+3]=45
=>n(39−3n)−90=0
=>39n−3n
2
−90=0
=>3n
2
−39n+90=0
=>n
2
−13n+30=0
=>n
2
−10n−3n+30=0
=>n(n−10)−3(n−10)=0
=>(n−10)(n−3)=0
=>n=10 or n=3
8. Игральную кость кидают 6 раз. Какова вероятность того, что «шестерка» выпадет а) не менее трех раз; б) не более трех раз?ъ
Answer:
б) не более трех раз
Car A travels 60 miles in 2 hours. The distance car
B travels is given by the equation where d is the
distance, in miles, that car B travels in t hours.
Based on this information, which statement is true?
The speed of Car A when it travels 60 miles in 2 hours is 30 miles per hour. This is the rate. Therefore, that is true.
How to illustrate the rate?From the information, it should be noted that Car A travels 60 miles in 2 hours. It should be noted speed is calculated as:
Speed = Distance / Time
It should be noted that speed simply means the distance that's travelled with respect to time.
Speed = 60 / 2
Speed = 30 miles per hour
Note that an overview was given as enough information wasn't given about Car B.
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each side of a square is increasing at a rate of 2 cm/s. at what rate (in cm2/s) is the area of the square increasing when the area of the square is 64 cm2?
At 32 cm^2/s rate the area of the square is increasing when the area of the square is 64 [tex]cm^{2}[/tex]
As per given problem each side of a square is increasing at a rate of 2 cm/s. let side of square is x.so the area of it is A= [tex]x^{2}[/tex].now differentiating w.r.t time A
[tex]\frac{dA}{dt}[/tex]= 2x[tex]\frac{dx}{dt}[/tex]
when A=64 [tex]cm^{2}[/tex] x=8 cm
also given [tex]\frac{dx}{dt}[/tex]=2cm/s
so [tex]\frac{dA}{dt}[/tex]=2×2×8=32
So at 32 cm^2/s rate the area of the square is increasing when the area of the square is 64 [tex]cm^{2}[/tex]
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Patients in a study about a new medication were asked to rate their symptoms on a scale from 1 to 10 each hour, over a period of 8 hours after taking the medication. On the given scale, 1 represents symptoms being the least bothersome, and 10 represents them being the most bothersome. It is found that over this time period, the function y=0.5x2−3.6x+8.9 best models the patient's rating y, x hours after taking the medication.
What is the predicted rating 2.5 hours after taking a dose? Round your answer to two decimal places.
It is to be noted that the predicted rating after taking a dose in two decimal places is 5.53. See the explanation below.
What is the explanation for the above answer?Recall that we are given the expression:
y= 0.5x²−3.6x+8.9 .......................function 1
After 2.5 hours,
Predicted Rating (y) =
0.5 (2.5)² - 2.6 (2.5) + 8.9 [Substitute x into the function]
y= 0.5 (6.25) - 2.6 (2.5) + 8.9 [Expand the brackets]
y= 3.125 - 6.5 + 8.9
y= 5.525
Hence the predicted rating in two decimal places is 5.53. This means that the symptoms have been reduced by at least 50%.
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The diagram shows a semi-circle inside a rectangle of length 150 m.
The semi-circle touches the rectangle at A, B and C.
Calculate the PERIMETER of the shaded region. Give your answer correct to 3 significant figures. Ive worked out everything so far but im missing a mark
The diagram shows a semi-circle inside a rectangle of length 150 m.
The semi-circle touches the rectangle at A, B and C, the perimeter of shaded region is 267.8m
Perimeter of a circle = 2 πr
Thus, as per the diagram given:
Length of rectangle = 150 m
The radius of semi circle = half of 150 m = 75 m
So, the width of the circle is same as radius = 75 m
The shaded region is bounded by the circumference of a quarter circle (AB) and the two sides measuring it are 75 m each.
Perimeter of Quarter circle = 2πr
On substituting r
Perimeter of Quarter circle = 2π x 75
Perimeter of the shaded region = 117 + 75 + 75 = 267.8 m
The diagram shows a semi-circle inside a rectangle of length 150 m. The semi-circle touches the rectangle at A, B and C, the perimeter of the shaded region is 267.8m
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what must be added to the positive difference between 4³/10 and 7⅔ to obtain 25
The number that must be added to the positive difference of 4³/10 and 7⅔ to obtain 25 is 21 [tex]\frac{19}{30}[/tex]
What number should be added?A mixed number is a non-integer that is made up of a whole number, a numerator and a denominator. An example of a mixed number is 21 [tex]\frac{19}{30}[/tex].
The first step is to determine the positive difference between the mixed numbers. If the difference is positive, it means that the smaller fraction was subtracted from the larger fraction.[tex]7\frac{2}{3} - 4\frac{3}{10}[/tex]
[tex]3\frac{20 - 9}{30}[/tex] = [tex]3\frac{11}{30}[/tex]
The next step is to subtract 3 11/30 from 25
25 - [tex]3\frac{11}{30}[/tex] = 21 [tex]\frac{19}{30}[/tex]
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two cards are drawn without replacement from a standard deck of 52 playing cards. what is the probability of choosing a jack and then, without replacement, a face card? express your answer as a fraction or a decimal number rounded to four decimal places.
The graph of f(x) = |x| has been stretched by a factor of 2.5. If no other transformations of the function have
occurred, which point lies on the new graph?
(-4,-4)
(-3,7.5)
(-2,5.5)
(-1,-2.5)
Answer:
B
Step-by-step explanation:
Due to the absolute value sign....there will be no negatives in the answer for y.... so either b or c
2.5 * |-3| = 7.5 so answer B
( Please help + Will mark brainliest )
Answer the question in photo.
Answer:
3/2
Step-by-step explanation:
6/4 = 1.5
3/2 = 1.5
So we know 1.5 is the scale and it asks for it in fraction form which would be 3/2.
PLSSS HELP IF YOU TURLY KNOW THISS
Answer:
1y is the answer!
Step-by-step explanation:
-6y+7y=1y
Answer:
-6y + 7y = 1y
Step-by-step explanation:
[tex]32 - 6y + 7y - 2y^2[/tex]
-6y + 7y = 1y
7y - 6y = 1y or y
the whole equation would be [tex]-2y^2+y+32[/tex]
Which trigonometric ratio can be used to find the measurement of F using only the lengths shown.
The trigonometric ratio which can be used to find the measurement of F using only the lengths is: D. tangent only.
What is a tangent?In geometry, a tangent is also known as a tangent line and it can be defined as a straight line that touches a plane curve at a specific point.
Mathematically, the tangent of an angle is given by this expression:
Cosθ = Adj/Hyp
Where:
Hyp represents the hypotenuse of a right-angled triangle.Adj represents the adjacent side of a right-angled triangle.θ is the angle.Since both the opposite side and adjacent side of this right-angled triangle are given, cosine is the trigonometric ratio which can be used.
For this right-angled triangle, the cosine of the angle (θ) is given by:
Cosθ = 9/F
F = 9/Cosθ
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Which expression is equivalent to quantity y raised to the negative second power times z raised to the seventh power end quantity over quantity z raised to the negative third power times y raised to the eighth power end quantity all raised to the negative second power? z raised to the tenth power over y raised to the tenth power y raised to the tenth power over z raised to the tenth power z raised to the twentieth power over y raised to the twentieth power y raised to the twentieth power over z raised to the twentieth power
The expression z raised to the twentieth power over y raised to the twentieth power is equivalent to the expression given in the question.
y raised to the negative second power = [tex]y^{-2}[/tex]
z raised to the seventh power = [tex]z^{7}[/tex]
Thus, in the numerator we have the expression- [tex]y^{-2} z^{7}[/tex]
In the denominator, we will have-
z raised to the negative third power = [tex]z^{-3}[/tex]
y raised to the eighth power = [tex]y^{8}[/tex]
denominator will be = [tex]z^{-3} y^{8}[/tex]
Thus, the expression becomes-
[tex](\frac{y^{-2 }z^{7} }{z^{-3} y^{8} })^{-2}[/tex]
Now, that we've decoded the expression, let us solve it-
[tex]({y^{-2 }y^{-8} z^{7} z^{3} )^{-2}[/tex]
= [tex]({y^{(-2-8) } z^{(7+3)})^{-2}[/tex]
= [tex]({y^{(-10) } z^{(10)})^{-2}[/tex]
= [tex]{y^{(-10*-2) } z^{(10*-2)}[/tex]
= [tex]{y^{(20) } z^{(-20)}[/tex]
= [tex]\frac{z^{20} }{y^{20} }[/tex]
= [tex](\frac{z}{y} )^{20}[/tex]
Thus, the expression z raised to the twentieth power over y raised to the twentieth power is equivalent to the expression given in the question above.
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A rectangle is 8m longer than it is wide. If the length is increased by 2m and the width is increased 2m, the area is
increase by 68m 2. Find the original dimensions.
Answer:
width=x
length=x+8
area= x(x+8)
new width =x+2
new length=x+10
New Area = (x+2)(x+10)
(x+2)(x+10)-x(x+8)= 68
after solving:
4x=68-20
4x=48
x=12
width=12m
length=12+8=20m
Answer: what
Step-by-step explanation:
Hama is three times as old as David and the sun of their ages is 52. Determine their ages.
Using Algebra, Age of David is 13 years old, and Hama is 39.
Explain what algebra is.The area of mathematics known as algebra deals with symbols and the formulas used to manipulate them. These symbols, which are currently expressed as Latin and Greek letters, are used in elementary algebra to represent variables, or quantities without set values.
If David were n years old and Hamas was 3 years old, then:
n + 3n = 52
4n = 52
n = 13
3n = 3 * 13 = 39
13 plus 39 equals 52
David is 13 years old, and Hama is 39.
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You have found the following ages (in years) of all 4 bears at your local zoo:
5, 4, 6, 39
What is the average age of the bears at your zoo? What is the variance?
Round your answers to the nearest tenth.
Average age:
Answer: 13.50
Step-by-step explanation: Add all the ages and divide it by the number of bears
PLEASE HELP! Marta is buying soft drinks for the class party. The table below shows the prices of 4 different packages of cola, the number of bottles in each package, and the ounces of cola per bottle.
The price of a 10-ounce bottle is $0.79
The price of a 12-ounce bottle is $0.99
The price of a 20-ounce bottle is $1.64
The price of the 64-ounce bottle is $4.98
Package price of 10-ounce bottles = $3.19
Number of bottles in the package = 4
Price per bottle = Package price/Number of bottles = 3.19/4
= $0.79
Package price of 12-ounce bottles = $5.99
Number of bottles in the package = 6
Price per bottle = Package price/Number of bottles = 5.99/6
= $0.99
Package price of 20-ounce bottles = $6.56
Number of bottles in the package = 4
Price per bottle = Package price/Number of bottles = 6.56/4
= $1.64
Package price of 64-ounce bottles = $4.98
Number of bottles in the package = 1
Price per bottle = Package price/Number of bottles = 4.98/1
= $4.98
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Please help me please help me
three cards are drwan at random, without replacement, from a standard deck of 52 playing cards. compute the (conditional) probability that the first card drawn is spade, given that the second and third cards have spades.
If the second and third cards have a spade then the probability that the first card drawn is a spade is 21.2%.
Probability can be described as a field of mathematics that determines how likely a thing is to happen. When there is uncertainty about the outcome of an event we consider the probabilities of certain results or outcomes.
There are a total of 13 spades in a deck of 52 playing cards. So if the second and third cards have spades then there are 11 spades remaining.
The formula for probability can be given as;
probability = number of favorable outcomes or events ÷ total number of outcomes or events
probability = 11 / 52 = 0.212
Converting it into percentage;
probability = 0.212 × 100 = 21.2%
Therefore, the probability that the first card drawn is a spade is calculated to be 21.2%.
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Which of the following is an obtuse triangle? A. Triangle BB. Triangle CC. Triangle A D. Triangle D
Triangle b is a obtuse triangle.
What is a triangle ?A closed triangle has three vertices, three sides, and three angles. The symbol for a triangle with the three vertices P, Q, and R is PQR. Sandwiches and signboards in the shape of triangles are the most prevalent triangle-shaped objects.
A triangle has an obtuse angle if one of the inner angles is greater than 90 degrees. In an obtuse triangle, if one angle is greater than 90°, the total of the other two angles is also less than 90°.
As the triangle B have one interior angle as 126 degree which is greater than 90
so it follows the property of obtuse triangle
Hence, triangle b is a obtuse triangle.
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