Can you write me an equation that expresses the fact that a function f is continuous at number 3. I hope it makes sense.

During a nine-hour snowstorm, it snows at a rate of 1 inch per hour for the first 2 hours, at a rate of 2 inches per hour for the next 6 hours, and at a rate of 0.5 inch per hour for the final hour. Write and graph a piecewise-defined function that gives the depth of the snow during the snowstorm. How many inches of snow accumulated from the storm?

What is the difference between the input and the output of a function?

Describe why the horizontal line test is an effective way to determine whether a function is one-to-one?