Guys, Help me, and an explanation would also be nice, please.

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

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.

When is g(x) = 0 for the function g(x) = 5.23x + 4?