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 = 6 and z = -3, what is the value of 9b(b - z)?
| 12 | |
| 90 | |
| 30 | |
| 486 |