When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
If a = 8 and z = 7, what is the value of -9a(a - z)?
| -60 | |
| 36 | |
| -72 | |
| 0 |