I need help with this

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.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

How many $20 bills do you need to have to make $280