F(x) = x(x + 2)(x − 9) how many zeros does this equation have

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?

Sorry guys but as you have a small brain

What statement is true? 2x^2-9x+2=-1