exam Maths Puzzle Numerical Ability

Find the domain of rational function: (2x+1)/(x-5)+1/(x+7)

A. real numbers except 5 and -7
B. real numbers except -35
C. real numbers except 2
D. all real numbers

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exam Other Question

Can you please help me solve this: Which term in each of the following has the lowest degree in x?

5x^2 - 3x^3 + 7 + 2x - a^3x + 8x^6

thank you so much! I need to find the slop of any line perpendicular to the line through points (0,5) and (-3,-4)