Let f f be a differentiable function such that f(3)=4 f ( 3 ) = 4 and f′(3)=5 f ′ ( 3 ) = 5 . if g(x)=x2f(x) g ( x ) = x 2 f ( x ) , what is the value of g′(3) g ′ ( 3 ) ?

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?