Which expression is equivalent to the model? (look in attached image)

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?

What is the maximum of the sinusoidal function

Solve 2x − 1 = 11 for x using the change of base formula log base b of y equals log y over log b.