Please help me with this, thank you

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?

Aladder that is 20 ft. long against the side of a building. f the angle formed between the ladder and the ground is 75 degrees, how far is the bottom of the ladder from the base of the building?