Pls pls pls help this is introduction to angles

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?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Find the values of y: 3y^3(y^2+ 2/3y)=0