exam Maths Puzzle Numerical Ability

please help me solve this equation f(x) = 3x^2 -41

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exam Other Question

The president of a company producing water pumps has gathered data suggesting that the average cost in dollars of producing x units per hour of a new style of pump will be C(x)=x s Suppose the sales of a particular brand of appliances satisfy the relationship:

S(x) = 140x + 100

where S(x) represents the number of sales in year x, with x = 0 corresponding to 1982. Find the number of sales in 1987