exam Maths Puzzle Numerical Ability

Minimizing cost.

A company uses the formula C(x)=0.02x2-3.4x+150 to model the unit cost in dollars for producing x stabilizer bars. For what number of bars is the unit cost at its minimum? What is the unit cost at that level of production.

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YESTERDAY YOU BOUGHT A HUGE WATERMELON THAT WEIGHS 100 POUNDS. A WATERMELON IS 90% WATER. YOU LEFT IT OUTSIDE IN THE HOT SUN. SOME OF THE WATER EVAPORATED, SO IT IS NOW 80% WATER. HOW MUCH DOES THE WATERMELON WEIGH NOW? what are 2 functions for the following equation:

((x+1)/10)^2 + (y/5)^2 = 1