Find the component form and the magnitude of the vector v

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters

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