book Maths Puzzle Numerical Ability

Divide.

(21y^5 – 28y^4 + 14y^3) / 7y

Thanks!

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book Other Question

write a system of two equations in tow unknowns for each problem.

At Gween's garage sale, all books were one price, and all magazines were another price. Harriet bought four boo 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!!!!!!!!!!!!