Find the exact value of cos(u + v) given that sin u = 7/25 and cos v = -12/13 (both u and v are in quadrant 2)

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?

Qrst is a parallelogram. determine the measure of ∠q pls