Answer:
5x-6
Step-by-step explanation:
f(x) = 2x + 3
g(x) = 3x - 9
f(x) + g(x) = 2x + 3 + 3x-9
= 5x-6
First one
.20 is 20% of 100 and there is 5 boxes and 5 times 20 = 100
a+bi