Question

Your monthly cell phone bill is determined by a fixed monthly fee of $35 for 300 anytime minutes and $.40 for each additional minute used. Dependent variables can be the result of more than one independent variable. Consider your phone bill as presented above. Aside from being charged for minutes over 300, you are charged $1.25 for each directory assistance call and $.75 per minute for long distance roaming calls. You also have to contribute at least $1.50 to the federally required Universal Service Fund per month and this value may vary on your phone bill but is not an independent variable. 1