Simplify the equation(-3)^-4

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

It takes jonas 7 1/4 minutes to run the mile. it takes mario 8 5/12 to run the mile. how much faster is jonas than mario? 5/6 minute 1 1/3 minutes 1 1/6 minutes 1 1/2 minutesi will give points and brainlest

If you could answer these your a life saver