Question

What is the value of the expression if z=27?
7/9z-18+1/3z
12
30
48
84

Answer 1

12

Explanation:

got it right on edge

Answer 2

12

Explanation:

`(7)/(9)z-18+(1)/(3)z\\\\\text{Substitute}\ z=27\\\\(7)/(9\!\!\!\!\diagup_1)\cdot27\!\!\!\!\!\diagup^3-18+(1)/(3\!\!\!\!\diagup_1)\cdot27\!\!\!\!\!\diagup^9=(7)(3)-18+(1)(9)\\\\=21-18+9=12`