exam Maths Puzzle Numerical Ability

what is the vertex for -0.8x^2+2.3-7.2x

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exam Other Question

Given a right triangle ABC, with angle A = 90degrees and AB=4, AC=6, find the length of altitude AD. I need help with simplifying:
3/x+1 + 3
/ divided by 3x/x-1 -3.