Question

I can’t figure these out D:

Answer 1

Explanation:

16. 9a=15x12

9a=180

a=20

17. 9-t=t+3

-t-t=3-9

-2t=-6

t=6/2

t=3

18. 2y+12=3y+12-y

2y+y-3y=12-12

0=0

=> 2y= -12

y= -6

19.

17+3z-6-11z=-7z-14

17+3z-6-11z+14=-7z

17-6+14=-7z-3z+11z

25= -10Z+11z

25=Z