instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: if a - b = 6 and a 2 + b 2 = 50 , find the value of ab .
answer:
a ) 7


question:
Problem: during a car trip , maria stopped to rest after she traveled 1 / 2 of the total distance to her destination . she stopped again after she traveled 1 / 4 of the distance remaining between her first stop and her destination , and then she drove the remaining 135 miles to her detination . what was the total distance , in miles from maria ' s starting point to her destination ?
answer:
360


question:
Problem: if the area of a circle is 64 pi square feet , find its circumference .
answer:

16 pi fee