book Maths Puzzle Numerical Ability

What Does t equal in 8t-r=12t

Read Solution (Total 0)

book Other Question

Simplify by dividing:

x^3+2x^2+3x-6/x-1

I don't understand why I can't do this, but I know once I see it I'll hopefully understand! :) suppose that f(x)=ax+b if (f(x))=8x+21 then what a+b