(x + yi) + (4 + 9i) = 9 - 4i

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.