Can you explain which one

Three coins are flipped. what is the probability that there will be at least two tails?

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.

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !