book Maths Puzzle Numerical Ability

Can you list the factors of the number 8?

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book Other Question

what is the exact measure (in degrees) of an obtuse angle. my teacher said it was 90 degrees < angle < 180 degrees. how do you simplify a square root such as 3(square root sign)24??? i am not sure how to do a problem like this, if you could break it down and explain to me how to do problems like this example i would be greatful. than you for your time.