exam Maths Puzzle Numerical Ability

How do you convert an equation like 2^-1 c^-4 d^2 into an equation with only positive exponents?

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exam Other Question

the sum of four consecutive odd integers is 184. what are the integers? PLEASE HELP!!!
Need to make at least 12 helicopters and at least 20 airplanes per month.
Limit on number of helicopters to (no more than) 72 per month
Can sell helicopters for 3