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Lesechka [4]
3 years ago
14

Darnell has $1.20 in quarters and nickels. He has 8 coins altogether. How many coins of each kind does he have?

Mathematics
2 answers:
dexar [7]3 years ago
8 0

Answer:

4 quarters

4 nickels

Step-by-step explanation:

Romashka [77]3 years ago
5 0
4 quarters 4 nickels
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180.6 is the answer 240 4/5 is 240.8
240.8/4 is 60.2
60.2 x 3 is your answer
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When asked there favorite drink 22 students said juice 34 students said milk 28 students said soda and 36 students said water .s
Agata [3.3K]
The 22 students who answered juice would represent the smallest wedge in a pie chart.
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Can 2/8 be simplified?
Vikki [24]

Answer:

yes it can. the answer is 1/4

Step-by-step explanation:

2 divide by two is 1 2 divided by 8 = 4

3 0
3 years ago
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We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year
Annette [7]

Answer:

n=\frac{0.3(1-0.3)}{(\frac{0.025}{1.96})^2}=1290.78  

And rounded up we have that n=1291

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

2) Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.025 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

And replacing into equation (b) the values from part a we got:

n=\frac{0.3(1-0.3)}{(\frac{0.025}{1.96})^2}=1290.78  

And rounded up we have that n=1291

4 0
3 years ago
Find the volume of the solid
kipiarov [429]

Answer:

The volume of the solid is 24 in^3

Step-by-step explanation:

The most general form of the equation of the volume of a pyramid is

V = (1/3)(base area)(height)

In this case,

V = (1/3)(18 in^2)(4 in) = 24 in^3

7 0
3 years ago
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