Use the picture were it says a, b, c, d those are the steps

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.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a