Anamari will drive 35.5 miles to her aunts house.
Explanation:
Let the miles will Anamari drive to her aunts house be x
The scale on the map is 2 inches = 5 miles
Now she walks 6.4 inches south and 7.8 inches east
So she has walked = 6.4 + 7.8 = 14.2 inches
According to the scale
2 inches = 5 miles
then
14.2 inches = x
By cross multiplication
2x = (5) (14.2)
2x = 71

x = 35.5