How does graphing help you solve a system of linear equations? i need the answer asap please

Find the zeros of the function. write the smaller solution first, and the larger solution second f(x)= (x+6)^2-49

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?

Could someone with number 1 and 2