Can somebody please answer this

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

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?

Solve the system of equations. 2x-2y=-4 and x+y=8. show work