Mathematics, Help, not sure about my answer on this one

This figure consists of a rectangle and semicircle. what is the perimeter of this figure use 3.14 for pi 60.84m 72.84m 79.68m 98.52m

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?