D= (x:x is a straight line passing through the given point of a plane). Is this a null set? can anyone answer this question

Extra points! find the missing dimension! need asap

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a diamond or heart. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability of randomly selecting a diamond or heart or club. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability of randomly selecting queen or club. (type an integer or a decimal rounded to three decimal places as needed.)