Is either x=9 or x=15 a solution to x-3=12? A. x= 9 is a solution, but x =15 is not
B. they are both solutions
C. x=15 is a solution, but x=9 is not
D. neither is a solution

It's 15

c. x=15 is a solution but x=9 is not

Step-by-step explanation:

15-3=12

9-3=6

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation:

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.