Does y=2.5 satisfy 2y-1=4

Which of the following transformations will always produce a congruent figure?

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

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?