book Maths Puzzle Numerical Ability

2x^2+7x-4=0

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book Other Question

The upper Angel Falls, the highest waterfall on Earth, are 750 m higher than
Niagara Falls. If each of the falls were 7 m lower, the upper Angel Falls
would be 16 times as high
how do i simplify a question like : 2/3(6h-1)