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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book Other Question

i do not know how to do pre allgabra will you be willing to teach me ?? Draw a sketch of the following Parent Fuctions and then name the function

1. y=x^2
2. y= 1/x
3. y = 2^X