Can someone explain to me how to do this?

Ajar contains a mixture of 20 black marbles, 16 red marbles, and 4 white marbles, all the same size. find the probability of drawing a white or red marble on the first draw. 125 12 01 next question ask for turn it in

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)