exam Maths Puzzle Numerical Ability

Please help me solve this problem: -4/8 < 2/3c. I understand how to get the 2/3 on the other side but when I get to the multiplying part I get stuck.

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exam Other Question

Simplify the following index 3 of 9x^7y^5 . index 3 of 6x^6y^10z^5
Thanking you
6-/20 over 2

How do I do this problem?
Thanks in advance!
ac