How do you know whether you have to write a sum in simplest form

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

If g(x) is an odd function, which function must be an even function?

You are shooting hoops after school and make 152 out of a total of 200. what percent of shots did you make? what percent did you miss? show proportion(s).