exam Maths Puzzle Numerical Ability

Find the greatest common factor of the numbers or monomials.


9.16,68

Any help with this equation would be GREATLY appreciated.

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exam Other Question
If x2 - 13x + 42 = (x + A)(x + B), then A + B =

-42
-1
13
42
none of these
I need help with a story problem.
A diamond is purchased for $2500. Suppose it increases 5% in value each year. Find the value after 8 years.


Thanks.