F(x) = 3x + 10

f(8) =

hmmm I'm not sure, but I want to ask. Do u speak German? (Deutsch)

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8