Answer:
B.64 miles
Step-by-step explanation:
Let Oliver's be x
Let Stephanie's be y

substitute for x in (b):

find x in (a):

Step-by-step explanation:
260 square inches
is the right answer
6000 - 1800 = 4200
4200/4 = 1050
so she donated 25% to charity
You just add the values for volunteers that worked 16-20 hours and 21-25 hours which would be 50 + 10 = 60. So the total number of volunteers that workers more than 15 hours is 60.