exam Maths Puzzle Numerical Ability

when trying to find a function you put in 2,5,4,3,and get out 4,13,10,7.
What is the function is it that I am trying to find? and what is the answer in the form of x>>something.

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exam Other Question

Hello, I've struggled with conic sections for two months and keep getting the wrong answers.
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<b>Problem #7: "Find the foci for each hyperbola and sketch a graph of <br> {{{y^ 80. Work. Henry sold 120 magazines subscriptions in x+2 days. If he sold at the same rate for another week, ten how many magazines did he sell in the extra week?