Answer:
Francine run 5.495 miles
Step-by-step explanation:
Given :
 Francine ran   laps around the circular track in the school gym.
  laps around the circular track in the school gym.
 The track has a diameter of 1/2 miles.
To Find :  About how far does Francine run?
Solution : 
First we need to calculate the perimeter of circular track :
Perimeter of circle :  
Since we are given the diameter = 1/2 miles = 0.5 miles
So, Radius will be (Diameter/2) = 0.5/2 = 0.25 miles
So, The perimeter will be:
  
 

Since 
⇒
⇒
Thus the circular track is of 1.57 miles .
Since she ran    = 7/2=3.5 laps
  = 7/2=3.5 laps
1 lap = 1.57 miles 
So, 3.5 laps = 1.57*3.5 =5.495 miles .
Hence ,  Francine run 5.495 miles