book Maths Puzzle Numerical Ability

Simplify: -3√[121]+(-1)^3

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book Other Question

graph the ellipse x^2 + 4y^2 =64 6. If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?
a. 3 b. 9 c. 5 d. 4 e. none
The answer on the answer key is D, but I have no clue how to get the same. Please help!