Help me please it’s due literally now please someone

The radius of the sphere is 10 units .what is the approximate volume of the sphere use π=3.14

So can you show me how to do the work and what 5 miles equals how many yards

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin