A plane, parallel to the center of the sphere, passes through the sphere at a distance of 20 cm from the center. The radius of the circular cross section is 15cm. What is the radius of the sphere?

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!