Find the distance between P (6,9) and Q (7,5) to the nearest tenth

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.

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.