Find the nonpermissible replacement for b in this expression b-7/b-1 ​

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Describe the relationship between the angles of similar triangles and the sides of similar triangles

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*