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
3y-x=8
5y-2x=6
rationalise\ the\ dino\min ator\ and\ simplify
-(3/2) * sin(49 pi /20) + 1
18/ $\sqrt{\Box}$ 3
