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finlep [7]
3 years ago
15

Ashley received a $70 gift card for a coffee shop. She used it in buying some coffee that cost $7.98 per pound.After buying the

coffee, she had $22.12 left on her card. How many pounds of coffee did she buy?
Mathematics
1 answer:
Reil [10]3 years ago
7 0

Answer:

6 pounds

Step-by-step explanation:

70-22.12=$47.88

47.88=7.98x

47.88/7.98=x

x=6

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Temka [501]

Answer:

26

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7 0
3 years ago
Read the following scenario, which is represented by a polynomial expression. Then answer the questions to interpret the parts o
Effectus [21]

Answer:

x is the number of $1 increase in the price.

If there is no increase, then the total money earned is

2 × 70 = 140

If there is $1 increase, then the total money earned is

(2 + 1) × [70 - 8(1)]

If there is $2 increase, then the total money earned is

(2 + 2) × [70 - 8(2)]

If we continue the pattern, for x times $1 increase, total money earned is

(2 + x)(70 - 8x) = -8x^{2} +54x+140−8x2+54x+140

If we substitute x = 0 in the above equation, we will get

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Hence, 140 is the constant term and it represents that there is no increase in price.

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nikitadnepr [17]
The two-sided alternative hypothesis is appropriate in this case, the reason being we are asked "does the data indicate that the average body temperature for healthy humans is different from 98.6◦........?".
The test statistic is:
Z= \frac{\bar{X}-\mu}{ \frac{s}{ \sqrt{n} } }} =-5.47
Using an inverse normal table, and halving \alpha for a two-tailed test, we look up p=0.5-\alpha/2=0.5-0.005=0.495 and find the critical value to be Z = 2.5758.
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