exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Please help me simplify this expression:

the square root of x^2
Find the slope and the y-intercept.
y = 4x - 2

The answer I came up for this one is 2 for the slope. Is this correct? If not could you show me what I did wrong and explain how to find the slope and y-intercept. Thanks for your time and help.