Answer:

7. f(-1)= 11

8. f(12)=-54

9. f(9)= -39

10. f(0)=6

Step-by-step explanation:

7. f(-1)=-5x+6

=-5(-1)+6

=5+6

f(-1)=11

8. f(12)=-5x+6

=-5(12)+6

=-60+6

f(12)= -54

9. f(9)=-5x+6

=-5(9)+6

=-45+6

f(9)= -39

10.f(0)= 5x+6

=-5(0)+6

=0+6

f(0)=6