2010 · Q35
If a quantity y varies as the sum of three quantities of which the first varies as x, the second varies as -x + x2, the third varies as x3 – x2 then what is y equal to ?
Elementary MathematicsAlgebra
- Akx3 where k is a constant
- Bkx + lx2 + mx3 where k, I, m are constants
- Ckx2 where k is a constant
- Dkx where k is a constant
Explanation
Sum = x+(-x+x²)+(x³-x²)=x³, so y=kx³.