Question

Which equation best represents this situation? The number 84 increased by an unknown number is equal to 115.

A. 84 + C = 115
B. 84 - C = 115
C. 84 ÷ C = 115
D. 84C = 115

Answer 1

I would say option A is the correct answer....

hope this helps :)

Answer 2

The phrase "increased by an unknown number"  indicates the operation of addition.  Increase by a constant is same as adding.

------> 84 + C = 115