if f(x) = 1/x and g(x) = x+1 determine the value of f o g(3) and gof(3)

if f(x) = 1/x+1, then the expression f(1+h)-f(1)/h can be simplified to?

please explain which one of these describes the definition of the limit limx->t f(x) = L

(a)if given any number > 0, there exists a number > 0, such that for all x,

0 < |x - t| < implies |f(x) - L| < .

(b)if given any number > 0, there exists a number > 0, such that for all x,

0 < |x - t| < implies |f(x) - L| < .

(c)if given any number > 0, there exists a number > 0, such that for all x,

0 < |x - t| < implies |f(x) - L| > .

(d)if given a number > 0, there exists a number > 0, such that for all x,

0 < |x - t| < implies |f(x) - L| > .

(e)none of the above.