7. (10 Points) Find the exact area in the positive quadrant enclosed by the x - axis, the y - axis and the graph of y = -ex + 5. Hint: Notice that the function has a value at x = 0, so we will need to know where the function crosses the x - axis. That is to say, we need the x - value at y = 0. Points) Find the following integral using a u substitution. xe (3x*+1) dx 3 2 \\ + 9 [1 ) = 6X