Molly has n coins of witch d of them are 1$ coins and the rest are 50cent coins write an experession for the amount of money in dollar molly has in term of d and n evaluate the expression if n=16 and d=9

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

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.

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?