Select all that apply

which of the following names a ray in the drawing?

cb

bf

a f

ab

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

If you are dealt 4 cards from a shuffled deck of 52? cards, find the probability that all 4 cards are diamondsdiamonds.

Yvaries directly as x. y =90 when x=6. find y when x=13