Question

PLZ PLZ Help me! I don't know how to do this.
Can someone please help me.

Answer 1

N in this problem is equal to 15.

Answer 2

7)
4n + 5 + 8n - 5 = 180
12n = 180
    n = 15

answer
Last one
n = 15
8)
8.5x + 2 = 9x - 6
-0.5x = -8
      x = 16
answer
B. x = 16

9)

4z + 3z + 6 = 90
7z = 84
  z = 12

answer
A. z = 12