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3 years ago

Doug can download new songs for $1.19 each. Write an equation to show how many songs he can download for $12.00

Mathematics

2 answers:

geniusboy [140]3 years ago

8 0

Answer: $1.19x=12$

Step-by-step explanation:

Given : Doug can download new songs for $1.19 each.

Let the number of songs downloaded be x .

Then the total cost of x songs will be :-

$1.19x$

To find the number of songs he can download for $12.00 , we need to put $1.19x$ equals to 12.

We get, the equation to show how many songs he can download for $12.00 will be

$1.19x=12$

Leni [432]3 years ago

6 0

Answer:

1.19x=12

Step-by-step explanation:

The 12 represents his budget and 1.19 is the cost of each song, x is the amount of songs.

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You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the

Vesna [10]

Answer:

A sample size of at least 1,353,733 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , 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 .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

You would like to be 98% confident that you esimate is within 0.1% of the true population proportion. How large of a sample size is required?

We need a sample size of at least n.

n is found when M = 0.001.

Since we don't have an estimate for the proportion, we use the worst case scenario, that is $\pi = 0.5$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.001 = 2.327\sqrt{\frac{0.5*0.5}{n}}$

$0.001\sqrt{n} = 2.327*0.5$

$\sqrt{n} = \frac{2.327*0.5}{0.001}$

$(\sqrt{n})^{2} = (\frac{2.327*0.5}{0.001})^{2}$

$n = 1353732.25$

Rounding up

A sample size of at least 1,353,733 is required.

5 0

3 years ago

Which is the slowest rate? a. 2,983 km in 5 hr

Eddi Din [679]

Answer:

C. 3,094 km in 12 hr

Step-by-step explanation:

we need to find kilometer per 1 hour so

2983/5=596.6 kilometers per hour

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Have a wonderful day! ask me if you have more questions

7 0

3 years ago

Around 2.232 to the nearest hundredth

Korolek [52]

$2.232\approx2.32$

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3 years ago

Which of the following expressions is a polynomial?

Cloud [144]

Polynomial requirements
1. never divide by a placeholder
2. variable exponent has to be a whole number
3. can't have infinte terms

by 1. we eliinate 2nd one

by 2. we eliminate first one (√x=x^1/2) and 3rd one because it has an exponent in placeholder

thie leaves us with last one
f(x)=2x³-5x⁵-(2/9)x²+9

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4 years ago

Read 2 more answers

M is the incenter of triangle ABC. Find the lengths of MD and DC. (Look at pic)

Deffense [45]

Answer:

Part 1) $MD=9\ units$

Part 2) $DC=12\ units$

Step-by-step explanation:

Step 1

Find the length of MD

we know that

The incenter is the intersection of the angle bisectors of the three vertices of the triangle. Is the point forming the origin of a circle inscribed inside the triangle

In this problem

$MD=ME=MF$ ------> is the radius of a circle inscribed inside the triangle