36*n^2 + 2*n
factorize
7x+5y=3
3x-2y=-7
express 10 seconds of a ratio of 6 hours in its simplest form
lim[t→∞] (1000t) / (1 + 0.1t)
3c+4d=30
3d+2c=21
8+9
15c-8d=50
5c+4d=50
an inverstment of £1600 was made, but only saw a return of £1584. What is the percentage change of the investment?
195 + (x-2)(x+1) = (4x+1)(2x+1)
18/ $\sqrt{3}$
rationalise the dinominator and simplify
