MATHEMATICS COLLEGE

James walked 11 miles in 4 hours. If he walkedthe same distance every hour, how many feet
did he walk in one hour?
A 14,520 ft
B 21,120 ft
C 29,040 ft
D 58,080 ft
Help?

Answers

Answer 1

Answer:

Answer:

A. 14,520 ft

Step-by-step explanation:

To start off this problem, we need to find how many miles James walks per hour. To do that, lets divide 11 by 4.

$x=(11)/(4)$

$x=2.75$

Next, since 5,280 feet are in a mile, we need to multiply 2.75 by 5,280:

$x=2.75(5,280)$

$x=14,520$

James walked 14,520 ft. in one hour.

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Answers

Answer:

it willbe 10 make it like an equation

You are on the market for a new car. You want to check whether there is a significant difference between the fuel economy of mid-size domestic cars and mid-size import cars. You sample 17 domestic car makes and find an average fuel economy of 34.904 MPG with a standard deviation of 4.6729 MPG. For imports, you sample 15 cars and find an average MPG of 28.563 MPG with a standard deviation of 8.4988. Construct a 90% confidence interval for the difference between the true average fuel economies in question. Assume the difference will represent (domestic - import). You can also assume that the standard deviations are statistically the same between the two populations.

Answers

Answer:

Step-by-step explanation:

Hello!

The objective is to test if there is a difference between the fuel economy of mid-size domestic cars and mid-size import cars.

For this there are two samples taken:

X₁: Fuel economy of a domestic car.

Sample 1

n₁= 17 domestic cars

X[bar]₁= 34.904 MPG

S₁= 4.6729 MPG

X₂: Fuel economy of an import car.

Sample 2

n₂= 15 import cars

X[bar]₂= 28.563 MPG

S₂= 8.4988 MPG

To estimate the difference between the average economic fuel of domestic cars and import cars, assuming both variables have a normal distribution and both population variances are unknown but equal, the statistic to use is a t-test for two independent samples with pooled sample variance:

(X[bar]₁-X[bar]₂)± $t_(n_1+n_2-2;1-\alpha /2) * (Sa*\sqrt{(1)/(n_1) +(1)/(n_2) } )$

$Sa^2= ((n_1-1)S_1^2+(n_2-1)S^2_2)/(n_1+n_2-2)$

$Sa^2= (16*(4.6729)^2+14*(8.4988)^2_2)/(17+15-2)= 45.35$

Sa= 6.73

$t_(n_1+n_2-2;1-\alpha /2) = t_(30; 0.95)= 1.697$

(34.904-28.563)± $1.697* (6.73*\sqrt{(1)/(17) +(1)/(15) } )$

6.341±1.697*2.38

[2.30;10.38]

With a confidence level of 90%, you'd expect that the difference between the average economic fuel of domestic cars and import cars will be contained in the interval [2.30;10.38].

I hope it helps!

2.23 round to the nearest tenth.

Answers

2.2

since the third number isn’t equal to or above 5, it rounds down.

What is a rational number

Answers

A rational number is any number, positive or negative. This can be numbers including fractions, decimals, whole numbers, and so on.

As long as it is a real number it's a rational number.

In addition, any number that can be turned into a fraction is rational.

Answer:

A Rational Number can be made by dividing two integers.

Step-by-step explanation:

What would the decimal number 20 be in binary?

Answers

10100 is the answer hope it helps you.

A person's heart rate is 65 beats per minute at rest. It increases by 12 beats per minute for each ofthe first 10 minutes of exercise. What is the person's heart rate after 6 minutes of exercise?

Answers

the heartbeat per minute is 137 i used calculator

Final answer:

The heart rate of the person after 6 minutes of exercise, assuming it increases by 12 beats per minute during this period, would be 137 beats per minute.

Explanation:

The question asks for the heart rate of a person after 6 minutes of exercise, given that it increases by 12 beats per minute during the first 10 minutes. To solve this, we start with the person's resting heart rate, which is 65 beats per minute. For each minute of exercise, we add 12 beats to the resting rate. So for 6 minute workout, the increase would be 6 times 12, which equals 72. Adding this to the resting heart rate, 65 + 72, the heart rate after 6 minutes of exercise would be 137 beats per minute.