exam Maths Puzzle Numerical Ability

3x+x(x-2)=4

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exam Other Question

Simplify by factoring. Assume that all expressions under the radical represent nonnegative numbers.

4√405x^4y^6

I hope that shows up the way it's supposed to.

Thank This is from a worksheet, sorry

Two people with the flu visit a college. The number of days T that it took for the flu viruses to infect n people is given by: T=-1.43Ln{10,000-n