exam Maths Puzzle Numerical Ability

x(squared)+9=4x

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My question is combination word problem and cost function. I struggle a lot with these. Please assist.
The total cost (in dollars) of producing x compact disks is C(x)=6.80x+ 450 A baseball player with a batting average of 0.300 comes to bat. What are the odds in favor of the ball player getting a hit?