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3 years ago

If you can bike 15 miles per hour, how long will it take you to bike 5 miles?

Mathematics

2 answers:

RideAnS [48]3 years ago

5 0

Answer:

20 min

Step-by-step explanation:

5 is 1/3 of 15

That means that the time is 1/3 of a hour which is 20 min

Dafna11 [192]3 years ago

3 0

5 miles is 1/3 the distance of 15 miles

if it takes you an hour to go 15 miles it will take you 1/3 the time to go 5 miles.

1 hour (60 minutes) / 3 = 20 minutes

it will take you 20 minutes

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In a random sample of students who took the SAT test, 427 had paid for coaching courses and the remaining 2733 had not. Calculat

Dvinal [7]

Answer:

The 95% confidence interval for the proportion of students who get coaching on the SAT is (0.1232, 0.147).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

427 had paid for coaching courses and the remaining 2733 had not.

This means that $n = 427 + 2733 = 3160, \pi = \frac{427}{3160} = 0.1351$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a p-value of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1351 - 1.96\sqrt{\frac{0.1351*0.8649}{3160}} = 0.1232$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1351 + 1.96\sqrt{\frac{0.1351*0.8649}{3160}} = 0.147$

The 95% confidence interval for the proportion of students who get coaching on the SAT is (0.1232, 0.147).

8 0

3 years ago

Can someone tell me a joke or say something that happened in your life before? thx lol im bo.red

Alla [95]

Answer:

well my brothers parakeet died 2 days ago sooooooooooooo......

Step-by-step explanation:

4 0

3 years ago

Please help me guys, thanks

mr_godi [17]

Answer:

R = 0.06

Step-by-step explanation:

Hello

If, I = PRT

then,

900 = (7500)*R*2

R = 900/15000

R = 0.06

Best regards

6 0

3 years ago

Marie is purchasing a $108,000 home with a 30 year ortgage at 5.25%. What is her monthly principal and interest payment

schepotkina [342]

Answer:

Monthly interest rate is r=0,004375

Monthly principal c=590,625

Step-by-step explanation:

Monthly interest payment rate :

$r=\frac{5.25}{12}:100=0,0004375$

Now, we need to find monthly principal payment : $c=\frac{rP}{1-(1+r)^{-N}}$

Use this rule : $N=30*12=360$

P=108000

r=0,004375

$c=\frac{0.004375*108000}{1-(1+0.004375)^{-360}} =\frac{472.5}{0.8}=590,625$

5 0

3 years ago

Read 2 more answers

Ax + b2 = cx + d2<br> ????

ryzh [129]

Answer:

x=b^2+d^2/a-c

Step-by-step explanation:

5 0

3 years ago