exam Maths Puzzle Numerical Ability

an agent sold 250 boxes of apples at $6.50 each. He charged a commission of 5%. What was his commission?

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exam Other Question

Hi.

What is the least common denominator of the following set:

1/(a+1)^2, 1/(a-1)^2, and 2/a^2-1


Thanks for your help!
Could someone please help me with determining the foci and the equation of the asymptotes?

(y+1)^2-(x-1)^2=1