book Maths Puzzle Numerical Ability

May I ask another question please? In learning about a circle, the instructor explained that C=2 pi r, A=pi r squared. This should then give a formula for finding the radius and t

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book Other Question

I can't seem to get the answer to this problem.

r=-0.08p^2+300p

Factor out the price on the right hand side of the formula Rewrite the middle term as the sum of two terms and then factor completely

4z^3 - 18z^2 - 10z