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NeTakaya
3 years ago
7

Savannah bought a book for 85% of the original price. By what percent of the price was the book reduced

Mathematics
2 answers:
agasfer [191]3 years ago
7 0

Answer:

15%

Step-by-step explanation:

100-85=15

100%= the total cost of the book

85%= price she bought it for

15%= the percentage the book was reduced by

devlian [24]3 years ago
5 0
Fifteen Percent .....
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Solve the equation for x. 1 3 (6x − 9) = −33
KIM [24]

Answer:

<u>x = 1.07</u>

Step-by-step explanation:

13 ( 6x - 9) = -33

78x  - 117 = -33            ( opening brackets and multiplying )

78x  = 84                     ( - 117 taken to the other side makes it positive)

  x  =  84 / 78

  x  =  <u>1.07</u>

7 0
3 years ago
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Compare 2 x 10^4 and 8 x 10^3
agasfer [191]
2* 10^4 would be bigger than 8* 10^3.

10^4 = 10000*2=20000
10^3 = 1000*8=8000
8 0
2 years ago
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A researcher conducted an experiment to investigate the effectiveness of a medicated lotion in treating a skin irritation. A gro
Helga [31]

Answer:

It can be concluded that the medicated lotion has an effect on treating skin irritations.

Step-by-step explanation:

In this case we need to determine whether the medicated lotion was effective in treating the skin irritation or not.

The hypothesis can be defined as follows:  

<em>H₀</em>: There is no difference between the two proportions, i.e. <em>p</em>₁ - <em>p</em>₂ = 0.  

<em>Hₐ</em>: There is a significant difference between the two proportions, i.e. <em>p</em>₁ - <em>p</em>₂ ≠ 0.  

The information provided is:

n₁ = 40

n₂ = 40

X₁ = 36

X₂ = 16

Compute the sample proportions and total proportions as follows:

 \hat p_{1}=\frac{36}{40}=0.90\\\\\hat p_{2}=\frac{16}{40}=0.40\\\\\hat P=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{36+16}{40+40}=0.65

Compute the test statistic value as follows:

 z=\frac{\hat p_{1}-\hat p_{2}}{\sqrt{\hat P(1-\hat P)[\frac{1}{n_{1}}+\frac{1}{n_{2}}]}}=\frac{0.90-0.40}{\sqrt{0.65(1-0.65)[\frac{1}{40}+\frac{1}{40}]}}=4.69

The test statistic value is 4.69.

The decision rule is:

The null hypothesis will be rejected if the <em>p</em>-value of the test is less than the significance level.

Compute the <em>p</em>-value as follows:

 p-value=2\times P(Z

The <em>p</em>-value of the test is very small.

The null hypothesis will be rejected at any significance level.

Thus, there is a significant difference between the two proportions.

So, it can be concluded that the medicated lotion has an effect on treating skin irritations.

6 0
3 years ago
What’s the correct answer for this?
Angelina_Jolie [31]

Answer:

1) 6.946 to the nearest tenth is 6.9

2) 2.299 to the nearest hundredth is 2.30 (either way it become 0)

3) 0.951 to the nearest whole number is 1

4) 6.399 to the nearest hundredth is 6.40

5) 1.989 to the nearest tenth is 2

3 0
2 years ago
Solve. If there are X teams in a sports league and all the teams play each other twice, a total of N(x) gamers are played, where
WINSTONCH [101]

number of games is 90, so cost is

<span>90×46=4140</span>

4 0
3 years ago
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