Which graph best represents the function f(x)= -1/2e^x-1

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

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs

Asinusoidal function whose frequency is 1/6pi