book Maths Puzzle Numerical Ability

The measure of the area of a rectangle is 6a^2+7a+2. The width is a binomial of the form ap+q. What is the measure of the perimeter of the rectangle?

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These things are hard for me, can you please help?

simplify

cubed rt 9x^2y * cubed rt 3x^3y^2

Is the answer 3xy cubed rt 3x^2?

Thanks I would please like your help with this problem: 5x-3(2x-1)=5-3(-x+2)