book Maths Puzzle Numerical Ability

If y= 76 and N= 576 what would the answer be

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book Other Question

use the variable expression 3x-1.
evaluate the expression when x=-3,-2,-1,0,1,2,and 3.
Please!

help me out with this equation from the GRE ETS book .... I don't understand the result.

2^30 - 2^29
____________ = 2^28
2

THANK YOU SO MUCH!!!!!!!!!!!!