What is the volume of this rectangular prism?

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__cm³

Which equation matches the graph shown ?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?