exam Maths Puzzle Numerical Ability

I did not see anything on rational expressions. can you assist me is solving this problem?

-2x-8 / x(square)+ 2x-8

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exam Other Question

I need your help once again. Thank you all in advance

Estimate the following product by rounding each factor to the nearest hundred.
312x371 hi!
my problem is now: THE DISTANCE BETWEEN THE ROAD OF A BRIDGE AND THE TOP PART OF ITS ARCH IS 3m. IF THE ARCH OF THE BRIDGE IS GIVEN BY THE EQUATION
h(x)=7x-x^2, FIND THE HEIGHT OF THE BRIDGE.
thank you!