exam Maths Puzzle Numerical Ability

Find the LCM of 14a^2b^3 and 21ab^4

Please help me because I am confused!Thanks

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exam Other Question

Evaluate xy/yz if x = 12, y = -5/4, and z = -4/5 Simplify a^2-(2a-ab)-a(3b+a)

If anyone can help i would appriciate it please.

Thanks