Select all of the stories that can be represented by the equation

What are “like terms”? why can we only add like terms?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Human body temperatures have a mean of 98.20° f and a standard deviation of 0.62°. sally's temperature can be described by z = 1.4. what is her temperature? round your answer to the nearest hundredth. 99.07°f 97.33°f 99.60°f 100.45°f