Which expression would demonstrate the use of the commutative property in addition in the first step of simplifying the expression (-1+i)+(21+5i)

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.

Which expression is equivalent to the expression shown?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}