The remainders when f(x)=ax^2+bx+ c is divided by x-1,x+1,x-2 are1,25,1 respectively. Show that f(x) is a perfect square,

There are 18 female students and 16 male students in a class. which of the following expresses the ratio of female students to male students in simplest form? а) 10 b) 9 to 8 c) 8: 9 d)18/16