Which statements about the graph of the function f(x)=-x^2-4x+2 are true? check all that !

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

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

What are the excluded values? m+5/mn+3m