Evaluate the following expression when b = - 4, - 4.5b=

18

Step-by-step explanation:

The question is asking you to evaluate - 4.5b, which is a simplified way of saying

-4.5 * b

Since we know that b = - 4, we can insert that instead of b.

-4.5 * - 4

The two negatives cancel each other out, so you're left with

4.5 * 4 = 18