Katelyn wants to buy a new cell phone. She decides to buy an iPhone 8 for a price of $449.99. She joins a plan with T-Mobile that will cost $55.35 per month for unlimited. Which of the following functions models the cost per year over the lifetime of the phone, C(n), in terms of the number of years, n, that she owns the phone?

Find the slope of the line: x = —4.

A car was valued at 38,000 in the year 2007. By 2013, the value had depreciated to 11,000 If the car’s valuecontinues to drop by the same percentage, what willit be worth by 2017 ?

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

The function C(x)=5x+900 represents the cost to produce x, number of items. Find ? the average cost function, c(x) ? how many items should be produced so that the average cost is less than $20?

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?

Graph: f(x)=x3 .