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## Homework Statement

Find the limit of each function

(a) as x approaches infinity and

(b) as x approaches negative infinity

## Homework Equations

1. g(x)=1/(2+(1/x))

2. f(x)=(2x+3)/(5x+7)

3. h(x)=(9x^4+x)/(2x^4+5x^2-x+6)

## The Attempt at a Solution

I don't know where to start.