exam Maths Puzzle Numerical Ability

C-3 Plumbing: The length of a rectangular pipe is three times longer than its width.. Find the dimensions that give a cross-sectional area of 75 sq. in.

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exam Other Question

Find the domain and range of the function
{{{{{18x^2-2}}}}}
Domain:
Range:
write the answer in interval notation. for the range just remember that x^2 is never ne Please help solve the following homework problem:

4/x-5=6/8x+2

I get -9/13, but am not sure if that is the answer.