Final answer:
Nancy drove 250 miles in February.
Step-by-step explanation:
To calculate the distance Nancy drove in February, we need to set up a proportion because we know that the 215 miles she drove in March represents 86% of the distance driven in February.
Let the total distance driven in February be x miles. According to the problem, 86% of x is equal to 215 miles.
The equation to represent this situation is:
0.86x = 215
To find the value of x, we divide both sides of the equation by 0.86:
x = 215 ÷ 0.86
x = 250
Therefore, Nancy drove 250 miles in February.