Final answer:
Multiplying 4.-10 results in -40.
Step-by-step explanation:
The equation 4.00 can be written as 4.0 x 1. By multiplying both sides of the equation by -10, we get -10(4.0 x 1) = -40. When multiplying a number by a negative value, the result becomes negative. Therefore, 4.-10 must equal -40.
Learn more about Multiplication of positive and negative numbers