Is y=x/4 proportional or non proportional?

When are triangles considered similar? a. corresponding angles are equal andcorresponding sides are proportionalb. corresponding angles are proportional andcorresponding sides are equalc. corresponding angles are equal orcorresponding sides are proportionald. corresponding angles are proportional orcorresponding sides are equal select the best answer from the choices providedmark this and retumsave and exitnext

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

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