Answer with justify please​

Find the distance between (0,5) & (-4,2)

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?

Graph the function =gx+2x3 and give its domain and range using interval notation.