Let i be an imaginary unit and let a, b,c, and d be real numbers. If (a+bi)(c+di)=2, then a not equal to 0 or d not equal to 0. Give a proof using the contrapositive.

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price

Hurry which expression is equivalent to 3√x^5y?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.