If i = −1 and a and b are non-zero real numbers, what is 1a+bi ?

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

Aflagpole broke in a storm. it was originally 8 1 81 feet tall. 2 8 28 feet are still sticking straight out of the ground, where it snapped, but the remaining piece has hinged over and touches the ground some distance away. how far away is the end of the pole from the base of the pole along the ground?