Calculus help ? area ?

Question

Let f(x) = (e^(-x))+1 for 0 < x < 3

Find the area of the region between the graph of f and the x-axis on the given interval. Give both exact (symbolic) and approximate (numeric) answers.

Answer 1

The function

Area under a curve region bounded by the given function vertical lines and the x - axis x = a and x = b given by

In this case 0 < x < 3

a = 0, b = 3

Approximate area  is 3.951 squre units.