exam Maths Puzzle Numerical Ability

Please help me simplify this expression:

the square root of x^2

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exam Other Question

When Frank and Mark finished milking, they found that they had 900 pounds of milk that was 2 percent butterfat. How much butterfat did they have to add to raise the butterfat content to 10 percent? Find the GCF of the product.

(3b+6)(2b-10)

I got 3 for the first parenthesis and 5 for the second but you can only have one answer. What am I forgetting?