exam Maths Puzzle Numerical Ability

b-2 /b^2-4 over
b^2+b/b+1

Divide and simplify Factor if necessary

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exam Other Question

s= 1/3 πr^2 h+4πrh solve for r find the equation of the parabola determined by the given information
1.vertex at the origin,focus at (0,-3)
2.focus at (0,-7), directrix y=7
3.focus at (1,6),directrix x=-1