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k0ka [10]
3 years ago
13

A college student completed some courses worth 3 credits and some

Mathematics
2 answers:
zzz [600]3 years ago
8 0

I think its A.

the answer is 12.9045.

which is close to 13.

I hope this helps.

-BARSIC- [3]3 years ago
4 0

Answer:

  • A. 13

Step-by-step explanation:

<u><em>Note:</em></u><em> It seems typo in the question. 5% should read 59.</em>

Let 3 credit courses = x, 4 credit courses = y

<u>As per  given we have following equations:</u>

  • x + y = 18
  • 3x + 4y = 59

<u>Solve the system by elimination. Multiply the first equation by 4 and subtract the second one:</u>

  • 4(x + y) - (3x + 4y) = 4(18) - 59
  • 4x + 4y - 3x - 4y = 72 - 59
  • x = 13

The answer is 13

Correct choice is A

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