book Maths Puzzle Numerical Ability

how do u find 13% of $85.00?

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solving quadratic equations by factoring:

(x+5)(x+4)=0

2h^2-h-3=0
Simply: (2 -3x)^2 I need to really understand how they came up with the answer to this one, I have my final tomorrwo. Th e other problem is find the y intercept for 2x - 3y =6. Thank you so very much for any help. Thank you Thank you.