Question 36 ,38 Can you explain ? I don't know how to solve .

36 The volume of sphere A is 20 cubic centimeters. Sphere B has a radius that is 2 times the radius of sphere A. What is the volume, in cubic centimeters, of sphere B? 38 A quadratic function can be used to model the height, in feet, of an object above the ground in terms of the time, in seconds, after the object was launched. According to the model, an object was launched into the air from a height of 0 feet and reached its maximum height of 784 feet 7 seconds after it was launched. Based on the model, what was the height, in feet, of the object 3 seconds after it was launched