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3 years ago

Rosetta drove her car 160 miles in 2 hours. Which of the following correctly expresses her rate as a ratio?

2 answers:

7 0

Rosetta drove her car 80 miles in one hour. Assuming that you ate talking about miles per hour you decide 160÷2=80 therefore, she drove 80 miles per hour (80/mph)

iren2701 [21]3 years ago

4 0

Answer:

The correct answer is,

The rate of ratio of Rosetta's car = 80 miles per hour

Step-by-step explanation:

Formula:-

Speed = Distance /Time

It is given that,Rosetta drove her car 160 miles in 2 hours.

<u>To find the speed of car</u>

Speed = Distance /Time

Distance = 160 miles

Time = 2 hours

Speed = 160/2 = 80 miles per hour.

Therefore the rate of ratio of Rosetta's car = 80 miles per hour

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3 years ago

In a random sample of 5 residents of the state of Texas, the mean waste recycled per person per day was 1.9 pounds with a standa

sammy [17]

<h2>Answer with explanation:</h2><h2 />

The confidence interval for population mean is given by :-

$\overline{x} \pm\ t_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size : n= 5, since n<30 , so the test we use here is t-test.

Sample mean : $\overline{x}=1.9\text{ pounds}$

Standard deviation: $\sigma=0.89\text{ pounds}$

Significance level : $1-\alpha:1-0.99=0.01$

By using the standard normal distribution table , the critical value corresponds to the given significance level will be :-

$t_{n-1,\alpha/2}=t_{5-1,0.01/2}=t_{4,0.005}=4.604$

Now, the 99% confidence interval for the mean waste recycled per person per day for the population of Texas will be :-

$1.9\pm\ (4.604)\dfrac{0.89}{\sqrt{5}}\\\\\approx1.9\pm1.832\\\\=(1.9-1.832,1.9+1.832)=(0.068,\ 3.732)$

Hence, the 99% confidence interval for the mean waste recycled per person per day for the population of Texas = (0.068, 3.732)

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3 years ago

Find the equation of the line

kirill115 [55]

Answer:

Step-by-step explanation:

The line is passing through 2 points: (0,9 and (3,3)

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equation is : y-9=-2(x-0) or y=-2x+9

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2 years ago

Solve.

Eva8 [605]

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Answer: C 1, -3/2

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3 years ago

Divide a salad with six friends, 1/3 is missing, how much does each person get?

Talja [164]

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3 years ago