All categories

3 years ago

Someone please help me on this question please!!

Mathematics

1 answer:

s2008m [1.1K]3 years ago

4 0

Answer:

Yes, the estimate given is reasonable.

Explanation:

If we do the maths of this question with estimates, we can guess that the average mileage be about 26 or nearly 25 for easy calculation.

If each friend drives between 57 and 63, then the average be about 60.

So for a person with a mileage of 25 to go nearly 60 miles, he would have to use nearly 2.5 gallons. Therefore, for the 3 friends, it would be 2.5*3 = 7.5 nearly 7 gallons.

Thus his estimation was reasonable.

You might be interested in

In a Harris poll of 514 human resource professionals, 90% said that the appearance of a job applicant is most important for a go

Licemer1 [7]

Answer: The interval is 0.9 ± 0.0259 and margin of error is 0.0259

Step-by-step explanation: Confidence interval for a proportion in one sample is the estimate of the proportion of a population. It is calculated following the next steps:

1) Find the proportion $p=\frac{x}{n}$ , in which x is the number of people with the desired condition. In our case, p=0.9;

2) Calculate margin of error, i.e.:

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

z is z-score, which for a 95% confidence, equals 1.96;

Substituting with the data given:

$1.96(\sqrt{\frac{0.9(1-0.9)}{514}})$ = 0.0259

3) Write: p ± $z\sqrt{\frac{p(1-p)}{n}}$

In our case, the interval will be 0.9 ± 0.0259.

Margin of error is the random sampling error in the results of a survey, i.e.,it shows you how far your result will be from the real value. For the Harris poll, margin of error is 0.0259

7 0

3 years ago

What is the value of x when the Richter scale rating is 7.9 round your answer to the nearest

Oksi-84 [34.3K]

If no base is stated, then assume base 10
$log(x)=log_{10}(x)$
rememer
$a=log_b(c)$ translates to $b^a=c$

so
$r=log(x)$ or
$r=log_{10}(x)$ translates to $10^r=x$

so when r=7.9, what is x
$10^r=x$
$10^{7.9}=x$
79432823.472428=x
round to nearest ???
thousanth? 79432823.472=x
hundreth? 79432823.47=x
tenth? 79432823.5=x

4 0

3 years ago

Find the equation of a line through (2,-4) and (-7,-4)

steposvetlana [31]

---------------------------------------------
Find slope :
---------------------------------------------
$\text {Slope = } \dfrac{-4 - (-4)}{-7-2} = \dfrac{0}{-9} = 0$

When the slope is 0, the graph is a horizontal line.

Equation of the graph is y = -4

------------------------------------------------------
Answer: y = -4
------------------------------------------------------

3 0

3 years ago

Which equation represents the volume of a cone with the same base and height as the cylinder below?

Firdavs [7]

Answer:

Volume of cone = (1/3) * Volume of cylinder

Step-by-step explanation:

Use the formulas

Volume of cone = (1/3)* π r^2 *h

Volume of cylinder = π r^2 *h

Therefore

Volume of cone = (1/3) * Volume of cylinder

7 0

3 years ago

18 is what percent of 60?

anastassius [24]

18 divided by 60 = 0.3
0.3 x 100 = 30
18 is 30% of 60

7 0

3 years ago