book Maths Puzzle Numerical Ability

A right-angle triangle has hypoteneuse 10 inches, and the height drawn from the right angle to the hypoteneuse is 6 inches. Find the area of this right-angle triangle

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book Other Question

what is the value of Y when X=-3 for the function Y=4Xsquared+3X-1 okay, i have one simple question because i left my math book at home :X
3 / x+1 - 3/x-1

I know you must first change the subtract to add, and make the 3 negativ