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 = -9 and z = 6, what is the value of 3a(a - z)?
| -72 | |
| -40 | |
| 405 | |
| 18 |