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?

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.