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 b = -1 and z = 6, what is the value of 9b(b - z)?
| 252 | |
| -63 | |
| 63 | |
| 0 |