exam Maths Puzzle Numerical Ability

Beth is 14 years older than Aria. Last Year Beth was three times as old as Aria. How Old is Aria?

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exam Other Question

Given the ATC function
TC=5000Q-100Q^2+1.0Q^3
a. What is the level of output that maximizes profit
b. Show the value of Q as in a. where it minimizes the ATC The depreciation of a recent investment is modeled by the function, y=275(0.95)^x. What is the rate of depreciation, expressed as a percent? Can someone please explain?