Mandy's monthly cell phone bill is represented
by the function
y=0.10x + 70, where x
represents the minutes
and y represents the cost.

Function B
Angel's monthly cell
phone bill is
represented by the
function y=0.25x + 30,
where x represents the
minutes and y
represents the cost.

4. How much more expensive is
Function C than Function D if they
talk for 200 minutes each?