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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Use a graphing calculator to approximate the solutions of the equation in the interval )<_ X < 2(3.14). The equation is: 3 sin x + 5 cos x = 4 Please help me solve this word problem: If 110 students voted for Alyssa for class president, 60 students voted for bob, and 30 students voted for Charles, Calculate the percentage of the class that voted for each candidate.