Question 70·Easy·Nonlinear Functions
The graph shows , the number of bacteria (in thousands) in a lab culture hours after the start of an experiment.
Which choice is the value of ?
When a question asks for from a graph, go directly to on the horizontal axis, move vertically to the graph, and read the corresponding -value. Don’t use intercepts or other features unless the question asks for them.
Hints
Find
Locate on the horizontal axis (-axis).
Move to the graph
From , move straight up until you reach the plotted point/curve.
Read the height
Read the corresponding -value (in thousands) from the vertical axis.
Desmos Guide
Plot the point at
In Desmos, click on the graph (or add a point) at the clearly marked location where .
Read the -coordinate
Use Desmos’s displayed coordinates to read the -value of that point.
State
The -coordinate at is , so .
Step-by-step Explanation
Use the definition of function value on a graph
The value is the -coordinate of the point on the graph where .
Read the value at
At , the graph has a solid point at , so .
Therefore, the correct choice is .