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Please solve these for 20 points : solving formulas for a variable

Please solve these for 20 points : solving formulas for a variable-example-1
User Jesse Webb
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6. (A/pi = r^2)
7. [(P - 2l)/2 = w]
8. [C/(2pi)= r]
9. (2A/h = b)
10. (E/c^2 = m)
User Atef
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