Simplify the given expression:
(−5 + 3i) • (1 − 2i)

Find the value of the variable and the length of each secant segment.

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer