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scZoUnD [109]
3 years ago
15

Ivan bought 35 stamps. Some of these stamps cost $0.15 each, and the rest cost $0.40 each. If the total value of the stamps he b

ought is $7.25, determine the number of $0.15 stamps that Ivan bought.
Mathematics
1 answer:
3241004551 [841]3 years ago
6 0

Answer:

  27

Step-by-step explanation:

Let x represent the number of $0.15 stamps Ivan bought. Then the value of his stamps is ...

  0.15x +0.40(35-x) = 7.25

  -0.25x +14.00 = 7.25 . . . . . eliminate parentheses, collect terms

  -0.25x = -6.75 . . . . . . . . . . . subtract 14.00

  x = 27 . . . . . . . . . . . . . . . . . . divide by -0.25

Ivan bought 27 $0.15 stamps.

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well, bearing in mind that standard form for a linear equation means

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Meg initially has 3 hours of pop music and 2 hours of classical music in her collection. Every month onwards, the hours of pop m
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What is the value of -4x + 12 if x = -4
Nezavi [6.7K]

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3 years ago
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Let x be the required waranty period, then
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Therefore, they should waranty for 11 years so that no more than 6.7% fail within that time.

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Let the price be p, then
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