Can anyone help me with this?

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?

Which of the symbols correctly relates the two numbers below check all that apply 6? 6

Acircle has a circumference of 28.36 units what is the diameter of the circle