(3^9/3^5)^-2
(2^2/x)^-1
HOW TO CALCULATE 100% OCCUPANCY ROOM FOR MALAYSIANN IS 1113 AND FOREIGNER IS 15
20/x+1 - 20/x-1 = 2
Solve the following second degree inequality
x+4x-12< 0
find x
use mathematical induction to prove that 1+4+4^2+.....+4^n=(4^(n+1)-1)/3 for all non negative integers
d/x+1 - d/x-1 = 2
x^2+2x-249=0
(3x^-2 y^3)^-4
