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$140 for 18 ft² what's the unit rate?

Which expression is equivalent to 3^3 + 2^2?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Im so bad at fractions they are not my best math thing to work on