book Maths Puzzle Numerical Ability

the hypotenuse of a triangle is 48 feet. what kind of triangle is it?

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zeros of a function:
find the zeros (i.e. x-intercepts) of the following functions:
1) f(x)=-48x^2+3x^4
2) f(x)=-4x^3-15x^2+18x will you please help me factor this equation: 16k squared minus 80k plus 100. thankyou