Alvin was 15 feet below sea level. it then moved to 72 feet below sea level. please explain how to find how many feet the submarine descended and then tell how many feet did the submarine descended

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Asphere has a diameter of 10 in. what is the volume of the sphere?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.