exam Maths Puzzle Numerical Ability

Simplify the following index 3 of 9x^7y^5 . index 3 of 6x^6y^10z^5
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exam Other Question

if the sum of a number and 7 is tripled the result is 3 less than twice the number 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.