book Maths Puzzle Numerical Ability

How do u solve systems of equations by elimination. Help its for my mid-term review sheet.

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Can someone help me with this problem?

(Round to the nearest hundredth)
7 L = ____________ qt

Thanks,
Sher This math question has confused me. I know how to multiply exponents, but I am confused with the fact that this is negative. Can you please help me by showing me step by step.