a library normally collected $42.00 in fees a month. But in march they collected $60.48. What is the percent increase in the number of fees collected in march?

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?