exam Maths Puzzle Numerical Ability

Please help me solve this problem
Subtract
y/y^2+19+90 - 9/y^2+17y+72

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exam Other Question

How do I give an example of an exponential function. Convert this exponential function to a logarithmic function. Plot the graph of both the functions and post to the discussion fo this is from a work sheet. I need to know how to work this problem.

3x/4 + 1 = 10

Thanks