Find the mass of the solid in the first octant between the spheres x2+y2+z2=64 and x2+y2+z2=100 if the density at any point is inversely proportional to its distance from the origin. a) 9k pi b) 72k pi c) 6k pi d) 12k pi

Which of those sequences is a geometric sequence

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.