What is the solution to this subtraction sentence? -5/6 – (-1/2)

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?

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?

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20