Which equation has the correct sign on the product? A 45(-4)=180 B 13•3= -39
C (-8)(-8)= -64 D (-18)4 = -72

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

Anyone know? will mark brainliest if correct

What is the period of the sinusoidal function ?