Question

Evaluate: 7 z +(-z ), when z = 4.

Answer 1

First insert 4 into the place of every z. Making the problem 7(4) -4. Next multiply 7 and 4 to get 28, then simply subtract 4. Your answer will be 24

Answer 2

Plug 4 into the expression for the value z and complete the expression,
7(4)+(-4)=28-4
24.