Answer
$A=74.5$ $acres$
Work Step by Step
The area of the field can be calculated as:
$A=bh$
Where
$b=820yd$
$h=440yd$
We know that $1$ $ acre$ =$ 4,840~yd^{2}$. Thus, we have:
$A=(820yd)(440yd)=360,800yd^{2}=360,800/4840~acres=74.5$ $acres$