Solve the Problem $( 10,20 )$ And $( 30,40 )$ B $( 50,70 )$

Multiple Choice

Solve the problem.
-The graph shows the height h (in meters) of a roller coaster t seconds after the ride starts.
a. Over what interval(s) does the height increase?
b. Over what interval(s) does the height decrease?

A) a. $( 10,20 )$ and $( 30,40 )$
b. $( 50,70 )$

B) a. $( 10,50 )$
b. $( 50,70 )$

C) a. $( 50,70 )$
b. $( 10,50 )$

D) a. $( 0,10 )$ and $( 30,50 )$
b. $( 10,20 )$ and $( 50,70 )$