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3 years ago

Kara found two websites that she could use to download songs.

Mathematics

2 answers:

Yuliya22 [10]3 years ago

7 0

Answer:

Step-by-step explanation:

Gnesinka [82]3 years ago

5 0

The answer is c because if you add it you’ll get that & that’s the only that makes sense.

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Complete each geometric sequence. B. 40, 120, ___, ___ C. 200, 20, 2, ___, 0.02, ___

zvonat [6]

B. 40, 120, 360, 1080
C. 200,20,2,0.2,0.002

4 0

3 years ago

Everyday Isabel swims 10-20 laps in a 50 meter pool. The amount of time she spends swimming is represented by the function f(x)

Inessa [10]

Given :

Everyday Isabel swims 10-20 laps in a 50 meter pool.

The amount of time she spends swimming is represented by the function f(x) = 3x .

To Find :

The speed of Isabel.

Solution :

Distance travelled in x laps is, D = 50x .

It is given that time taken is, t = 3x .

So, speed of Isabel is given as :

$Speed=\dfrac{Distance}{Time}\\\\Speed = \dfrac{50x}{3x}\\\\Speed = \dfrac{50}{3}=16.67 \ m/s$

Hence, this is the required solution.

6 0

3 years ago

Help!! A, B, C, or D

Elina [12.6K]

Pretty sure that you got it right..

7 0

3 years ago

Tobias's music store bought a piano at the wholesale price of $550. Tobias marked up the price 35%. What was the amount of marku

Mrrafil [7]

Answer:

A. $58.50

B. $80

C. No. The markup was 33 1/3%

Step-by-step explanation:

You are expected to know the relevant relationship is ...

cost + markup = selling price . . . . also called "store price" in this problem

___

A. The markup is 30% × $45 = $13.50, so the store price is ...

$45 + 13.50 = $58.50

___

B. When the 30% markup is added to the 100% cost, the selling price is 130% of the cost, or 1.30 times the cost. Here you have ...

$104 = 1.30 × cost

$104/1.3 = cost = $80 . . . . . divide by the coefficient of cost

___

C. The markup is $100 -75 = $25, so the markup percentage based on cost is ...

$25/$75 × 100% = 33 1/3%

This is not 30%.

Step-by-step explanation:

8 0

2 years ago

Pennies made prior to 1982 were made of 95% copper. Because of their copper content, these pennies are worth about $0.023 each.

aleksklad [387]

Using the z-distribution, it is found that since the test statistic is less than the critical value for the right-tailed test, it is found that this does not provide convincing evidence that the proportion of pennies in her containers that are pre-1982 copper pennies is greater than 0.132.

At the null hypothesis, it is tested if the proportion of pennies in her containers that are pre-1982 copper pennies not greater than 0.132, that is:

$H_0: p \leq 0.132$

At the alternative hypothesis, it is tested if it is greater, that is:

$H_1: p > 0.132$

The test statistic is given by:

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

In which:

$\overline{p}$ is the sample proportion.

p is the proportion tested at the null hypothesis.

n is the sample size.

In this problem, the parameters are:

$p = 0.132, n = 50, \overline{p} = \frac{11}{50} = 0.22$

Hence, the value of the test statistic is given by:

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

$z = \frac{0.22 - 0.132}{\sqrt{\frac{0.5(0.5)}{50}}}$

$z = 1.24$

The critical value for a right-tailed test, as we are testing if the proportion is greater than a value, using a 0.05 significance level, is of $z^{\ast} = 1.645$ .

Since the test statistic is less than the critical value for the right-tailed test, it is found that this does not provide convincing evidence that the proportion of pennies in her containers that are pre-1982 copper pennies is greater than 0.132.

You can learn more about the use of the z-distribution to test an hypothesis at brainly.com/question/16313918

6 0

2 years ago