Which of the following situations describes exponential growth?

A car's value decreases by 1,000 dollars each year.

A runner's speed increases by 0.1 m/s every minute.

A social media post's shares triple every hour.

A swimming pool is filled at a rate of 20 gallons per minute.

Consider the function in the table. What type of function is it? | $x$ | $f(x)$ | |:---:|:------:| | 0 | 5 | | 1 | 15 | | 2 | 45 | | 3 | 135 |

Linear, because the values increase by 10.

Exponential, because each $f(x)$ value is the previous one multiplied by 3.

Linear, because the x-values increase by 1.

Exponential, because the values are increasing.