True or false questions: 1a. If one input value has two output values corresponding to the input, it is a function.
1b. If two input values have the same one output value corresponding to the input values, it is not a function.
1c. If one input value repeats and there are two different output values corresponding the input value
It is not a function.
1d. In a set of the ordered pair of coordinates, x is an input value and y is an output value.
1e. If you identify if a graph is a function or not, you should take a vertical line test on x- axis in which you check up if a vertical line has two corresponding y values

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.