Answer
$58.5\ in^2$
Work Step by Step
To find the area of the page that will contain the essay, find the length and width of that portion of the page. Since there is a one inch margin on each side, reduce the length and width of the paper by 2 to find the length and width of the portion that will contain the essay.
$l=11-2=9$
$w=8.5-2=6.5$
Compute the area using the formula for the area of a rectangle.
$a=l\times w=9\times6.5=58.5$