exam Maths Puzzle Numerical Ability

Find the zeroes of the function without using technology:
y=(3^-2(x-4)) -sqrt27

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problem- If 20 lbs of rice and 10 lbs of potatoes cost $16.20, and 30 lbs of rice and 12 lbs of potatoes cost $23.04, how much will 10 lbs of rice and 50 lbs of potatoes cost?

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