book Maths Puzzle Numerical Ability

can u please help in finding this answer it's giving me aheadche....
Sn=2n^2-7n (Arithmetic Series)
find a1,d,a10.

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book Other Question

(-m) to the 2/3. Is that the square root of negative m to the third, or the cube root of negative m squared? A ten-gallon aquarium is 3 inches higher than it is wide. Its length is 21 inches., and its volume is 2730 inches cubed. What are the height and width of the aquarium?