exam Maths Puzzle Numerical Ability

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Textbook case: The accompanying graph shows the cost of producing textbooks and the revenue from the sale of those textbooks (C=10x+400,000)
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Is this as simple as adding two numbers togather? Find 2 consecutive even integers that have a sum of 450. hi please answer my problem

its a diagram so i cant type it

i dont understand how to do the problem

please and thank you so much

i appreciate it