I need help pls help i'm so stuck on this i don't even know what to do

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

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /