All categories

3 years ago

A car travels 80 miles on 5 gallons of gas. How many gallons of gas

Mathematics

1 answer:

dalvyx [7]3 years ago

5 0

Answer:

7 gallons

Step-by-step explanation:

Step 1:

80 : 5 = 112 : x

Step 2:

80x = 560

Answer:

x = 7

Hope This Helps :)

You might be interested in

Solve for x<br> 1 − 6x ≤ − 17<br> please help i am crying rn

irina [24]

Answer:

$x \geqslant 3$

Step-by-step explanation:

subtract 1 from both sides

-6x<-17-1

simplify

-6x<-18

divide by 6 on both sides

x>3

4 0

3 years ago

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 335335 babies were born

strojnjashka [21]

Answer:

The 99% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

Step-by-step explanation:

Confidence Interval for the proportion:

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 zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 335, \pi = \frac{268}{335} = 0.8$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.7437$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.8563$

For the percentage:

Multiplying the proportions by 100.

The 99% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

7 0

3 years ago

22broccy-here you go g-<br> what is the sum of negative two squared plus one?

yaroslaw [1]

Answer:

The sum is equal to 5

Step-by-step explanation:

we know that

The algebraic expression of the phrase " the sum of negative two squared plus one" is equal to

$(-2)^{2}+1\\=4+1\\=5$

8 0

3 years ago

Read 2 more answers

Hurry! Someone please help me I only have 5 minutes to do this quiz I don’t need you to show all your work just the answer becau

Doss [256]

Answer:

(x+x)(x+x+x)

Step-by-step explanation:

5 0

3 years ago

If you answer right ill give brainliest, PLEASE help :)

kumpel [21]

Answer: replace f(x) with y

y=x2+x−30

To find the roots of the equation, replace y

with 0

and solve.

0=x2+x−30

Rewrite the equation as x2+x−30=0

x2+x−30=0

Factor x2+x−30

using the AC method.

(x−5)(x+6)=0

Set x−5

equal to 0 and solve for x

x=5

Set x+6

equal to 0 and solve for x

x=−6

The solution is the result of x−5=0

and x+6=0

x=5,−6

Hope this helps!

8 0

3 years ago