What is the multiplicative identity of -4+8i?

Ineed with math stuff it involves graphs

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents

`if you have a set of parallel lines a and b cut by transversal x, if angle 1 = 167 degrees, what is angle 4 and why. also what is the measure of angle 5 and why? you need to use the names of the angle relationship and explain. ''.