exam Maths Puzzle Numerical Ability

Hi there, was wondering if someone could explain this for me?
Explain the meaning of "factor of a polynomial" and explain the meaning "to factor a polynomial"
thanks

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exam Other Question

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Thank You

Rationalize the denominator
3 sqrt3y^4 over 3 sqrt15x^4 How many pounds of hamburger that costs $1.10 per pound must be mixed with 50 pounds of hamburger that costs $1.80 per pound to make a mixture that costs $1.30 per pound?

I came up with 200. Please tell me if I am correct!