S is a subset within a universal set, U. If S = {x, y, 4, 9, ?}, which could describe U? U = {keys on a keyboard} U = {letters} U = {numbers} U = {punctuation marks}

9 x 8 divided by (5-3)=36

- (2, -7)

- lines r and s and lines t and u must be parallel

35%

step-by-step explanation:

is there more info provided? there is not enough information given in the problem