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 = 9 and z = 7, what is the value of -5b(b - z)?
| -90 | |
| -18 | |
| -45 | |
| -210 |