book Maths Puzzle Numerical Ability

-3x2 +x -2 =0

I only need to solve this in QF and don't need to find the discriminant.

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book Other Question

A = 1/2h(B+b)

area of a trapezoid

solve for b Hello, I could really use your help with this question.

What is the expression for the height of a cone in terms of its radius and volume?

Thanks, Amanda