A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9. What is the original number?
A: -30
B: -4
C: 4
D: 30

(No shown work is needed)

C: 4

Step-by-step explanation:

when a positive and negative number are multiplied you will get a negative number.

So,

4-7= -3

-3x3= -9

Therefore, your answer is C: 4. Hope this helps! :)

step-by-step explanation:

gym b charges $1.05 less per hour than gym a.

answer is 17