Zach bought his shoes for $39.
Austin bought his shoes for $48.
So, Austin paid $9 more for his shoes than Zach did.
Answer:
5x^2 + x + 10
Step-by-step explanation:
you appear to have a typo. I'd say
(f+g)(x) = f(x) + g(x) = 9-x + 5x^2+2x+1 = 5x^2 + x + 10
The second and the last are the correct ones