19 because 1 ten = 10 ones and 9 one plus 10 ones equals 19 altogether
The cost per unit of the auto shop function is the slope of the function
87 represents the slope and the cost per tire purchased
The function is given as:

A linear function is represented as:

Where:
m represents the slope or the unit rate.
So, by comparison:

This means that 87 represents the slope and the cost per tire purchased
Read more about slopes at:
brainly.com/question/18576224
The graph in the bottom left is correct
Answer:
if UW = 9x-9 then UW is 5 in units
Both of these variables represent a common measure used in chemistry.
The amount of material/volume is the material’s concentration.
The rate is the reaction is increase by altering the concentration.