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 = 4 and z = -1, what is the value of 9a(a - z)?
| 180 | |
| 25 | |
| -252 | |
| -6 |