6 Book sales in the U. S. totaled $16 billion in 1991. Sales increased about $1 billion a year until 2014. Write an equation to find the total sales (S) for any year (t) between
1991 and 2014. If this trend continues, what should sales be in 2020?
7
About 20,000 fewer babies were born in California in 1996 than in 1995. In 1995, about
560,000 babies were born. Write an equation that can be used to predict the number of
babies born (x) years after 1995 if this trend continues.

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.

Pls the last one and it has to be like number 6

Need solving this 2nd limit problem.