4) x^10x^8/(x^3)^3=x^18/x^9

=x^9 answer is c

5) (5x^2-6x+7)-(9x^2-3x-8)=5x^2-9x^2-6x+3x+7+8

=-4x^2-3x+15 answer is b

6) (5y-2)(5y^2+3y+3)=25y^3+15y^2+15y+10y^2-6y-6

=25y^3+5y^2+9y-6 answer is b

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