Math help!

The number of students taking sophomore mathematics at Union College has been decreasing at the rate of 20 per year for many years. Assuming this trend continues, write a multiplication problem that describes the change in the number of sophomores taking mathematics at Union for each of the following:
a: The change over the next 5 years
b: The situation 5 years ago
c: The change over the next n years
d: The situation n years ago

asked by KG
  1. clearly, at a change rate of -20 per year,

    (a) -20(5) = -100
    (b) -20(-5) = +100
    (c) -20n
    (d) -20(-n) = +20n

    posted by Steve
  2. for A do -20x5 then for B 20x5 C -20xn then for D 20xn. I think this is correct but not 100% sure so please correct me if I am wrong.

    posted by Lawyer
  3. Thank you very much, I appreciate it. You were correct.

    posted by KG
  4. what is the comparison ratio in lowest terms of the numbers 168 hours to 10 days

    posted by Donisha

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