Final answer:
To evaluate -1 2(-4 5), simplify the expression in the parentheses, which is -4 + 5 = 1. Multiply 2 with the result to get -2 as the answer.
Step-by-step explanation:
To evaluate the expression -1 2(-4 5), we start by simplifying the expression inside the parentheses, which is -4 + 5 = 1.
Next, we multiply 2 with the result from the previous step:
-1 * 2 * 1 = -2.
Therefore, the answer to the expression -1 2(-4 5) is -2.