Question

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

Answer 1

clearly, at a change rate of -20 per year,

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

Answer 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.

Answer 3

Thank you very much, I appreciate it. You were correct.

Answer 4

what is the comparison ratio in lowest terms of the numbers 168 hours to 10 days