exam Maths Puzzle Numerical Ability

Multiply and simplify.

-3a^2b/35a^5 x 14a^3b^2/-9b^4

I have come up with 2/15b. Is this correct?

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exam Other Question

i need step by step solution using elimination method,thank u

3x+4y=-15
3x+6y=-21
Divide.

5/x^6 divided by 10/x^3

Thanks!