If f(x)=2x and g(x)=5x, what is f(g(x) when x=3

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

Find the multiplicative inverse of 8-12i

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)