Answer:
The answer is D.
Explanation:
If we plug in the first two answers (-10):
-7(-10) +42 < or equal to 28
Two negatives equal a positive so: 70+42=112 which is not less than or equal to 28.
So both A and B are not correct, because -10 results in a number GREATER than 28.
This means it has to be either C or D and both use the number +2, so we'll try +1 to solve for C, and +3 to solve for D.
For C: -7(1) +42 < or equal to 28
-7+42=35 which is NOT less than or equal to 28
For D: -7(3) +42 < or equal to 28
-21+42=21 which IS less than or equal to 28
Each number greater than 2 will give you a larger number being subtracted from 42, and that result will always be less than or equal to 28.