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if one-fifth of a number and 8 has a difference of 13, what is the number?

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

Solve this 364x-64x=300x and 12(x2–x–1)+13(x2–x–1)=25(x2–x–1)

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6