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pav-90 [236]
3 years ago
14

Debra purchased a prepaid phone card for $30. Long distance calls cost 16 cents a minute using this card. Debra used her card on

ly once to make a long
distance call. If the remaining credit on her card is $22.48, how many minutes did her call last?
Mathematics
1 answer:
miv72 [106K]3 years ago
7 0

The answer is 47 minutes.

You basically imagine this: Debra has a phone card for $30. She used x minutes every 16 cents. You end up with $22.48.

30 - (0.16x) = 22.48

You can basically graph that equation and the x-intercept will show you your answer. x = 47

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Yuri [45]
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3 years ago
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Ten members of the academic team went to a local restaurant after their contest. Each meal combo that came with soda cost $6.75,
Aneli [31]

Answer:

7 ordered with Soda;

3 ordered with water

Step-by-step explanation:

Given

m \to With water

n \to With Soda

So:

m + n =10 --- total

5m + 6.75n = 62.25 -- cost

Required

Find m and n

m + n =10

Make m the subject

m = 10 - n

Substitute m = 10 - n in 5m + 6.75n = 62.25

5(10-n) +6.75n = 62.25

50-5n +6.75n = 62.25

Collect like terms

-5n +6.75n = 62.25 - 50

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Solve for n

n = 12.25/1.75

n = 7

m = 10 - n

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8 0
3 years ago
Seven-ninths of the pencils in a box are yellow. Three-tenths of the yellow pencils are sharpened. What fraction represents the
jek_recluse [69]

Answer:

7/30

Step-by-step explanation:

We are given that Seven-ninths (7/9) of the pencils in a box are yellow and three-tenths (3/10) of the yellow pencils are sharpened.

To find the fraction that represents sharpened yellow pencils, we find the product of the the fraction of yellow pencils and the fraction of yellow pencils that are sharpened.

That is:

=> (7 / 9) * (3 / 10)

=(7 * 3) / (9 * 10)

= 21 / 90

= 7 / 30

7/30 represents the fraction of sharpened yellow pencils.

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Find the value of the variable in each expression
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Answer:

they're all 0

Step-by-step explanation:

N/A

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