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3 years ago

Last winter, the Kranepool family used 431 gallons of heating oil at a price of $4.12

Mathematics

1 answer:

brilliants [131]3 years ago

5 0

Their approximate heating expense would be $1,920. Hope this helps!

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Caroline drove 350 miles. It took her 5 1/4 hours. what was her speed per miles

Helen [10]

Around 70mph count 50miles per 10mph and you’ll get 70mph by the you hit 350miles

8 0

3 years ago

I WILL GIVE BRAINIEST

Anit [1.1K]

Answer:

10 hours, 30 minutes.

Step-by-step explanation:

Distance ÷ Speed = Time

525 ÷ 50 = 10.5

7 0

3 years ago

Jay is 3 years less than 4 times Nelly’s age ( n ). Which expression represents Jay’s age?

NeX [460]

Answer:

Step-by-step explanation: 3x4= 12 -3=9

6 0

3 years ago

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A tuna can has a diameter of 5.3 cm and a height of 4.1 cm. What is the volume of a cylindrical package

STALIN [3.7K]

Using the formula v = pi x r^2 x h

pi x 18.0625 x 4

You will get the answer= 72.25pi

and rounded you get

7 0

3 years ago

The water diet requires you to drink two cups of water every half hour from the time you get up until you go to bed, but otherwi

Elan Coil [88]

Answer:

$7-3.182 \frac{13.638}{\sqrt{4}}= -14.698$

$7+3.182 \frac{13.638}{\sqrt{4}}= 28.698$

Step-by-step explanation:

For this case we have the following info given:

Weight before diet 180 125 240 150

Weight after diet 170 130 215 152

We define the random variable $D = before-after$ and we can calculate the inidividual values:

D: 10, -5, 25, -2

And we can calculate the mean with this formula:

$\bar X= \frac{\sum_{i=1}^n X_i}{n}$

And the deviation with:

$s= \sqrt{\frac{\sum_{i=1}^n (X_i- \bar X)^2}{n-1}}$

And after replace we got:

$\bar D= 7, s_d = 13.638$

And the confidence interval for this case would be given by:

$\bar D \pm t_{\alpha/2} \frac{s_d}{\sqrt{n}}$

The degrees of freedom are given by:

$df = n-1= 4-1=3$

For the 95% of confidence the value for the significance is $\alpha=0.05$ and the critical value would be $t_{\alpha/2}= 3.182$ . And replacing we got:

$7-3.182 \frac{13.638}{\sqrt{4}}= -14.698$

$7+3.182 \frac{13.638}{\sqrt{4}}= 28.698$

6 0

3 years ago