I Need help with this question

Mary had at least an 80% on her test write an inequality to represent this situation

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.

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.