Answer:
A) z=1
Step-by-step explanation:
1/5(3+2z)-4z=-3
3/5+2/5z-4z=-3
2/5z-20/5z=-3-3/5
-18/5z=-15/5-3/5
-18/5z=-18/5
z=(-18/5)/(-18/5)
z=1
12
cos l = 8/10
cos = b/h
=> cos l = 8/10