exam Maths Puzzle Numerical Ability

I know there is a help which can be used for solving quadratic equations, but I'm not sure how it works. Can you give that information and explain the process. It's something lik

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exam Other Question

Find the gcf for the group of terms:
-30a^3, 5a^4
Can someone help me show the number is rational by writing it as a quotient of two integers:

0.37