There are some 1-dollar bills, some 5-dollar bills, and a 20-dollar bill in an envelope. The number of 1- dollar bills is three times the number of the 5-dollar bills. We randomly pull a bill from the envelope. How
many 1-dollar bills are in this envelope if the expected value of the bill pulled is $2.72?
The number of 1-dollar bills is

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.