How do you calculate the volume of a sphere with a radius of 1 1/4 inches?

We are practicing for the ACT and this was one of the problems, and we are not really sure how to calculate 5/4 cubed into the equation.
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1 Answer

volume, spheer=(4/3)pi*r^3

r=5/4... kube=125/27=4.6296296

pi=3.14159265...

[(4/3)*pi=4.18879]*4.6296296=19.39255
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