In order to determine if engine oil EEEA B C will improve gas mileage, a research study was conducted. From a wide range of vehicle makes, models, and model years, 400 vehicles were randomly selected. Half of the vehicles were chosen at random to receive oil , and the other half received a generic brand of oil. The resulting data showed that vehicles that received engine oil had substantial improvements in gas mileage as compared to those that received the generic brand of engine oil. Which of the following can best be concluded based on the design and results of the research?
a. Engine oil E improves gas mileage better than any other available engine oil.
b. Engine oil E will cause a significant improvement in gas mileage.
c. Engine oil E will improve the gas mileage of any vehicle that uses it.
d. Engine oil E is likely to improve the gas mileage of cars that use it.

The regression equation is calculated as: ŷ = -0.99299X + 26.39918

We have these data for the x axis

12 15 20 22 15 8 6 17

These are the values for the y axis

17 15 6 7 6 18 21 7

Sum of X = 115

Sum of Y = 97

Mean X = 14.375

Mean Y = 12.125

Sum of squares (SSX) = 213.875

Sum of products (SP) = -212.375

Regression Equation = ŷ = bX + a

b = SP/SSX = -212.38/213.88 = -0.99299

a = MY - bMX = 12.13 - (-0.99*14.38) = 26.39918

ŷ = -0.99299X + 26.39918

These values where inputted into a regression analysis calculator and the output is ŷ = -0.99299X + 26.39918

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Answer:

The answer is:

B) Event E is certain to occur.

D) Event B is not likely to occur.

E) Event C has an even chance of either

Step-by-step explanation:

Event E is certain to occur. Event B is not likely to occur and Event C has an even chance of either occurring or not occurring so options (B),(D), and (E) are correct.

The probability of an event occurring is defined by probability.

Probability is also called chance because if you flip a coin, the probability of coming head and tail is nothing but the chance that either head will appear.

As per the given probability line.

The probability of event E = 1 so it will be certain to occur.

The probability of event B is very close to zero so it will not likely occur.

The probability of event C is 0.5 so it has an equal chance to occur or not.

Hence "Event E will definitely happen. Event C has an equal chance of happening or not, but Event B is not likely to happen".

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The full question below,

Answer:

Step-by-step explanation:

3:7 = ___: 49

3 : 7 = x : 49

x = 3 × 49 ÷ 7

x = 147 ÷ 7

x = 21

3 : 7 = 21 : 49  (your answer)

Answer: D

Step-by-step explanation:

Check the picture below.

Answer: 6 ten dollar bills

Step-by-step explanation:

At the start Sasha had seven ten dollar bills and 5 one dollar bills. It then says she has 15 one dollar bills after the exchange, she exchanged one ten dollar bill for 10 one dollar bills adding up to 15 one dollar bills and six ten dollar bills.

Answer:

2640 miles/day

Step-by-step explanation:

There are 24 hours in a day, so 110*24 = 2640.

Answer:

x=+/-3

Step-by-step explanation:

x^4-5x^2-36=0

factor

(x^2-9)(x^2+4)=0

split into 2 equations because one of these terms will need to equal zero for the eqation to be true

x^2-9=0              x^2+4=0

x^2=9                    x^2=-4

x=+/-3                    no real numbers

Answer:

B) X = ±2i and x = ±3

Step-by-step explanation:

Took the test

The angle LKJ in the triangle is 49 degrees.

The sum of angles in a triangle is 180 degrees. The measure of the angle LKJ can be found as follows:

Therefore, the angle LKJ can be found using trigonometric ratios as

follows:

Not the triangle is a right angle triangle. Therefore, one of its angles is 90 degrees.

Hence,

tan x = opposite / adjacent

tan x = 8.9 / 7.7

tan x = 1.15584415584

x = tan ⁻¹ 1.15584415584

x = 49.1346675513

Therefore,

angle LKJ = 49 degrees

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The 25th percentile for the math scores is 71.65.

In Mathematics and Geometry, the z-score of a given sample size or data set can be calculated by using this formula:

Z-score, z = (x - μ)/σ

Where:

Note: 25th percentile for the math scores is the same as the first quartile for the math scores.

Based on the z-score table A, 25th percentile (0.25) is equal to a z-score of -0.67;

0.2514 = -0.67

By substituting the parameters, we have:

Z-score, z = (x - μ)/σ

-0.67 = (x - 75)/5

x = 75 - 3.35

x = 71.65

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Answer:

52 units

Step-by-step explanation:

We can set 7x+10 equal to 9x-2, as BC bisects AD.

7x+10=9x-2 - Now we can isolate the variable

-2x=-12

x=6

Now, all we need to do is plug in 6 into one of our expressions:

7(6)+10=52

The nearest Whole percent, the percent increase of women students is approximately 21%.

The percent increase of women students, we need to compare the number of women students in 2005 and 2006.

In 2005, the number of women students was 123.

In 2006, the number of women students was 149.

To find the increase, we subtract the initial value (2005) from the final value (2006):

Increase = Final Value - Initial Value

Increase = 149 - 123

Increase = 26

Next, we need to calculate the percent increase. The percent increase is given by the formula:

Percent Increase = (Increase / Initial Value) * 100

Plugging in the values:

Percent Increase = (26 / 123) * 100

Calculating the percent increase:

Percent Increase ≈ 21.14%

Rounding to the nearest whole percent, the percent increase of women students is approximately 21%.

Therefore, the answer is 21%.

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The limit it converges to is 0

The equation for the graph above is y = 5sin(2x/3).

In Mathematics and Geometry, a sine wave is sometimes referred to as a sinusoidal wave, or sinusoid and it can be defined as a fundamental waveform that is typically used for the representation of periodic oscillations, in which the amplitude of displacement at each interval is directly proportional to the sine of the displacement's phase angle.

Mathematically, a sine wave can be represented or modelled by this mathematical equation:

y = asin(bx)

Where:

Based on the graph of this sine wave, we have:

Amplitude, a = 5.

Periodicity, b = 2π/period = 2π/(3π) = 2/3

Therefore, the required sine wave function is given by;

y = asin(bx)

y = 5sin(2x/3)

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The solution to the system of linear equations is (x, y, z) = (64/11, 37/11, 9/11). The system has exactly one solution.

Let's solve the system of linear equations correctly.

The given system of linear equations is:

x = y + 3z = 6

x - 2y = 5

2x - 2y + 5z = 9

To determine the number of solutions, we can analyze the system using the method of elimination or substitution. Let's use the method of elimination:

From equation 1, we have:

x = y + 3z

Substituting this value of x in equation 2:

(y + 3z) - 2y = 5

y + 3z - 2y = 5

-z + 3z = 5 - y

2z = 5 - y

Now, let's substitute the value of x in equation 3:

2(y + 3z) - 2y + 5z = 9

2y + 6z - 2y + 5z = 9

11z = 9

Simplifying the equation, we find:

z = 9/11

Now, substituting this value of z back into the equation 2z = 5 - y, we get:

2(9/11) = 5 - y

18/11 = 5 - y

18/11 - 5 = -y

18/11 - 55/11 = -y

-37/11 = -y

y = 37/11

Finally, we can substitute the values of y and z into equation 1 to find the value of x:

x = y + 3z

x = 37/11 + 3(9/11)

x = 37/11 + 27/11

x = 64/11

Therefore, the solution to the system of linear equations is (x, y, z) = (64/11, 37/11, 9/11).

The system has exactly one solution.

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Answer: X=55 and Y=125

Step-by-step explanation:

y is an external angle

so according to external angle property sum of two angles is equal to external angle. two angles are given- 35 and 90

90+35=y

y=125

now with angle sum property

90+35+x=180

125+x=180

x=55

please mark it brainliest

Step-by-step explanation:

If the slope is parallel m1=m2=-3

eqn of line is

y-y1=m(x-x1)

y-2=-3(x-3)

y-2=-3x+9

3x+y=11

We want to calculate the volume of the spherical shell of chocolate.

The chocolate shell is spherical with a thickness of 0.5cm

Volumes of spherical shells can be calculated with the formula;

The outer diameter is 8cm. The outer radius is therefore 4cm

The inner diameter is 8-2(0.5)=7cm. The inner radius is therefore 3.5cm

Therefore, we can find the volume of the chocolate shell as;

Therefore,

The sentence translation of "2/3y - 9 < y + 1" is "Nine less than two-thirds of a number is less than the number."

To translate the inequality expression "2/3y - 9 < y + 1" into a sentence, we can break it down into smaller parts:

"2/3y" represents two-thirds of a number.

"9" represents the number nine.

"y + 1" represents the number increased by one.

Now let's construct the sentence:

"Nine less than two-thirds of a number" - This refers to the expression "2/3y - 9," indicating that we have subtracted nine from two-thirds of a number.

"is less than" - This is the comparison symbol in the inequality.

"the number" - This refers to the expression "y + 1," representing the number increased by one.

Combining these parts, we form the sentence: "Nine less than two-thirds of a number is less than the number."

Hence, the correct sentence translation of "2/3y - 9 < y + 1" is "Nine less than two-thirds of a number is less than the number."

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The value of n can be determined by finding the number of visible arcs in the pattern, which is 30 in this case.

To determine the value of n, we need to find the relationship between the total length of visible areas and the number of circles (n).

In the given pattern, each circle contributes to the visible area twice: once as its circumference and once as the overlapping part with the adjacent circles. Since the circumference of each circle is 1 unit, the visible area contributed by each circle is 2 units.

Therefore, the total length of visible areas can be expressed as 2n. Given that the total length is 60 units, we can set up the equation:

2n = 60

Solving this equation, we find:

n = 60/2 = 30

Thus, the value of n is 30.

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Number of seats in each row is 51 given that a rectangular auditorium seats 2244 people and number of seats in each row exceeds the number of rows by 7. This can be obtained by assuming the value of number of seats in each row, forming quadratic equation and using quadratic formula to find root.

Here in the question it is given that,

We have to find the number of seats in each row.

Let us assume that the number of seats in each row be x.

From the given statement, number of seats in each row exceeds the number of rows by 7, we can write that,

Number of seats in one row = Number of rows + 7

x = Number of rows + 7

⇒ Number of rows = x - 7

Total number of seats in the auditorium can be written as,

⇒ (Number of seats in one row)(Number of rows) = Total number of seats

(x)(x - 7) = 2244

x² - 7x = 2244

⇒ x² - 7x - 2244 = 0

By using quadratic formula we can find the root,

x = (-b ± √b² - 4ac)/2a

here in the question, a = 1, b = -7, c = -2244

√b² - 4ac = √(-7)² - 4(1)(-2244)

√b² - 4ac = √49 + 8976

√b² - 4ac = √9025

√b² - 4ac = 95

x = (-b ± √b² - 4ac)/2a

x = (7 ± 95)/2

x = 102/2 or x = -88/2

⇒ x  = 51 or x = -44

Hence number of seats in each row is 51 given that a rectangular auditorium seats 2244 people and number of seats in each row exceeds the number of rows by 7.

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The sequence is decreasing as n increases and sequence converges to the value 0.

The given sequence is defined as aₙ = 1 / (7n + 3).

To determine if the sequence converges or diverges, we need to analyze its behavior as n approaches infinity.

As n increases, the denominator 7n + 3 also increases which means that the values of aₙ will get smaller and smaller, approaching zero as n becomes larger.

The sequence converges to the value 0.

The sequence is decreasing as n increases.

The sequence converges to the value 0.

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Answer:

Step-by-step explanation:

Well, since the length of a month can vary in the number of days, this answer can also vary.

For example, February is only 28 days long, while December is 31 days long.

That being said, the average length of all 12 months is 30.436875 days, so if Denny left to another country on June 20th, he would most likely be back   July 19th of July 20th.

I hope this helps!

The answer of the given question based on the right triangular prism is , the surface area of the prism is option (D) 2.6 + 12 + 8 + 8 = 30.

A right triangular prism is a three-dimensional solid that has two congruent, parallel triangular faces (also known as bases) and three rectangular faces that connect the bases at right angles. The perpendicular distance between the two bases is called the height of the prism.

To find the surface area of the prism, we need to calculate the area of each of its faces and then add them up.

The prism has two congruent triangular faces and three rectangular faces.

The area of each triangular face is equal to one-half the product of the base and height, which gives:

1/2 * 3 * 12 = 18

The area of each rectangular face is equal to the product of its length and width, which gives:

8 * 3 = 24 (two of these faces)

12 * 8 = 96 (one of these faces)

Therefore, total surface area of  prism is given by:

2 * 18 + 2 * 24 + 96 = 60 + 96 = 156

So the correct expression that represents the surface area of the prism is option (D) 2.6 + 12 + 8 + 8 = 30.

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Answer: 8

Step-by-step explanation:

From the circle.

CF . BF = EF . DF

9.6 = 3. (10+x)

54= 30+3x

3x = 24

x = 8

Answer: Approximately 34.17%.

Step-by-step explanation: Let's divide 41 by 120. Doing so, we get 0.3466666 looping forever. We can simplify that to .3417, and then turn that into a percentage giving us 34.17%

The answer of the given question based on the expression is , the value of the summation when m = 3 is 137.

In mathematics, an expression is a combination of numbers, variables, and operators that represents a value or a set of values. It can be a simple combination of numbers and variables or a more complex combination involving mathematical operations like addition, subtraction, multiplication, division, exponents, and roots. Expressions can be used to represent a wide range of mathematical concepts, from simple arithmetic to complex functions and equations.

To evaluate the summation 1(1!) + 2(2!) + 3(3!) + 4(4!) + m(m!), where m = 3, we substitute m = 3 and simplify:

1(1!)+2(2!) +3(3!) +4(4!) +3(3!)

= 1(1) + 2(2) + 3(6) + 4(24) + 3(6) (since n! = n(n-1)! for all positive integers n)

= 1 + 4 + 18 + 96 + 18

= 137

Therefore, the value of the summation when m = 3 is 137.

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Answer:

hello your question has some missing parts attached below is a picture of the complete question

Answer : 3.59

Step-by-step explanation:

Calculating the standard deviation, mean and standard error of the hourly wages

Area 1 : mean = 12.75 , std = 4.9497 , std error = 1.75

Area 2 : mean = 18.25, std = 4.3671,  std error = 1.54399

Area 3 : mean = 16.25, std = 2.8660, std error = 1.01330

mean = sum of terms / number of terms

std = \(\sqrt{}\) (X − μ)2 / n

std error = std / \(\sqrt{n}\)

The value of the test statistic to test for a difference in the areas is

3.59 ( using anova table attached below )

The percent decrease in the number of ponds that support brook trout would be approximately 47.37%.

To calculate the percent decrease in the number of ponds that support brook trout, we need to determine the difference between the initial number of ponds and the final number of ponds, and then express that difference as a percentage of the initial number of ponds.

Initial number of ponds: 19

Final number of ponds: 10

To calculate the percent decrease, we can use the following formula:

Percent Decrease = (Difference / Initial Value) * 100

Let's apply this formula to the given data:

Difference = Initial number of ponds - Final number of ponds

Difference = 19 - 10

Difference = 9

Percent Decrease = (9 / 19) * 100

Now, let's calculate the percent decrease:

Percent Decrease = (9 / 19) * 100

Percent Decrease ≈ 47.37%

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The solution to the equation x + 3 = 7 is x = 4.

So, yes, we have to subtract 3 from both sides of the equation to get the solution of the equation.

To solve this, we subtract 3 from both sides of the equation:

x + 3 - 3 = 7 - 3

This simplifies to:

x = 4

So the solution to the equation x + 3 = 7 is x = 4.

So, yes, we have to subtract 3 from both sides of the equation to get the solution of the equation.

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Given the equation x + 3 = 7, subtract 3 from both sides to solve for x