exam Maths Puzzle Numerical Ability

The second hand on a clock is 6 inches long. How far does the tip of the hand move in 40 seconds?

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exam Other Question

y=39-6x
x+3y=15

What are the coordinates on a graph for these equations?
Please show me how to simplify and write answer using only positive exponents.

Thanks!

(5K^-4m^6)^-2