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9966 [12]
3 years ago
11

Kayla wanted to buy a sweatshirt. The original price was $45. When she went to the store the sale price was $37. What is the per

cent discount on the sale price?
can someone explain how to solve this question.. it would mean a lot to me, thanks :)
Mathematics
1 answer:
crimeas [40]3 years ago
7 0

Answer:

You need to cross multiply 37/45+x/100 which equals 17%

Step-by-step explanation:

The first part represents the 37 dollars out of the original 45 and the second part represents x= the unknown percent out of 100 percent. This would be 17%

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Answer:

7-3.182 \frac{13.638}{\sqrt{4}}= -14.698

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Step-by-step explanation:

For this case we have the following info given:

Weight before diet 180 125 240 150  

Weight after diet 170 130 215 152

We define the random variable D = before-after and we can calculate the inidividual values:

D: 10, -5, 25, -2

And we can calculate the mean with this formula:

\bar X= \frac{\sum_{i=1}^n X_i}{n}

And the deviation with:

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And after replace we got:

\bar D= 7, s_d = 13.638

And the confidence interval for this case would be given by:

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The degrees of freedom are given by:

df = n-1= 4-1=3

For the 95% of confidence the value for the significance is \alpha=0.05 and the critical value would be t_{\alpha/2}= 3.182. And replacing we got:

7-3.182 \frac{13.638}{\sqrt{4}}= -14.698

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