Answer:

Step-by-step explanation:
 
        
             
        
        
        
Distance from home to store = 4 * 0.5 = 2 miles.
Time taken to return home = (2/12) * 60 =10 minutes.
Total distance traveled = 2 * 2 = 4 miles.
Total time taken = 30 + 10 = 40 minutes.
Average speed for entire trip = total distance / total time in hours.
 
 
        
        
        
Answer:
C. 128/3 meters cubed
Step-by-step explanation:
The volume of a cylinder is denoted by:  , where r is the radius and h is the height. We know it's equal to 64, so we can set that equal to V:
, where r is the radius and h is the height. We know it's equal to 64, so we can set that equal to V:


We know that the sphere and cylinder have the same height and radius. However, the "height" of a sphere is actually the same as its diameter, which is twice its radius. Then, we can replace h in the above equation with 2r:



Now, the volume of a sphere is denoted by:  , where r is the radius. From above, we know that
, where r is the radius. From above, we know that  , so we can plug this into the equation:
, so we can plug this into the equation:


Thus, the answer is C.