Vertical Compression of 1/3, right 2???

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?

The statements below can be used to prove that the triangles are similar. ? △abc ~ △xyz by the sss similarity theorem. which mathematical statement is missing? ∠b ≅ ∠y ∠b ≅ ∠z