What is the multiplicative identity of the complex number –4 + 8i?

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

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