32% of 25 pages in percent

Which of the following is true for the relation f(x)=2x^2+1

We just started the introduction into circles and i have no idea how to do this.

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)