Nathan is twice as old as Ben. Four years ago, Nathan was three times as old as Ben. how old are they now? Please I need help it’s due today!!

On a piece of paper graph f(x)=5•(0.4)^x

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

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?