exam Maths Puzzle Numerical Ability

how do I factor this polynomial? Thank you for your help :)

64x to the second -81.

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exam Other Question

I need help! Please show how to solve this problem. Thank you.

The demand and supply equations for a certain item are given by
D = -5p + 40
S = -p^2 + 30p - 8
Find The mass of one mole of hydrogen is 1.008 grams. A 100 gram sample of ascorbic acid contains 4.58 grams of hydrogen. To the nearest tenth, find the number of moles of hydrogen.