Find all the solutions to
\[\frac{x+4}{x+5} = \frac{x-5}{2x}.\]

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Evaluate cos2θ for cosθ = square root of 3/2