book Maths Puzzle Numerical Ability

How do i find the nth rule when a3=15 and a11=5 (the 3 & 11 are subscripts)

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Any help with this problem would be greatly appreciated

Rationalize the denominator:
2____
√[6] - √[5]

Thanks im graphing A linear equation that involves y = -x + 3 and y = x + 1 and i dont know how to graph it