Idont understand and explain. 1+2i=

Find the common ratio of the sequence. -4, 8, -16, 32, a: -12b: -2c: 12d: -1/-2

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?

Norder to get a certain shade of blue paint, a mixer must have 5 parts white paint to 3 parts blue. if 4 gallons of paint must be mixed, how many gallons of white paint must be used?