All categories

2 years ago

Hey I need some help with this question plz help me

Mathematics

1 answer:

icang [17]2 years ago

4 0

Answer:

Step-by-step explanation:

Let the nickels = x

Let the dimes = y

You don't know the total value of either. Nor do you know the total number of either.

You only know the total value of both together.

7.80 added to anything makes it bigger than 7.80 A is wrong.

y cannot be alone it should be multiplied by 0.5 C is wrong

D is wrong for the same reason A is

B is the correct answer. That is the way you write the problem

Number of Coins and value on one side. Total on the other.

You might be interested in

After filling a gas tank the odometer read 39.007.2 after the next filling it read 39.469.2 it took 17.5 gal to fill the tank, h

Nastasia [14]

(39,469.2 - 39,007.2)/17.5 will give you miles per gallon
The total miles driven were 462 miles/17.5 gal = 26.4 miles per gallon

3 0

3 years ago

8. How many 1/3 pound hamburger patties can be made out of 9 pounds

Sedbober [7]

Answer:

27 or im dumb

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Danni counted 48 apples in a basket of apples. The basket actually contained 46 apples. What is the percent error?

enot [183]

The answer would be 4.2%

5 0

3 years ago

Suppose that a market research firm is hired to estimate the percent of adults living in a large city who have cell phones. 500

Alborosie

Answer:

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

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

For this problem, we have that:

$n = 500, \pi = \frac{421}{500} = 0.842$

95% confidence level

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

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 - 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.81$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 + 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.874$

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

6 0

3 years ago

Find the length of the line AB

sergiy2304 [10]

Answer:

the length would be 12.

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers