Functions:

The function represents the cost.
The variable represents the number of dogs walked.
Answer:
tributary
Explanation:
A tributary or affluent is a stream or river that flows into a larger stream or main stem river or a lake. A tributary does not flow directly into a sea or ocean.
Answer:
Increase in the amount of soil entering the streams
Answer:
<em>Seismic Gap</em>
Explanation:
Seismic Gap<em> is a kind of an active fault that has not suffered with any of the significant earth-quaked from a long duration of time.
</em>
And Seismic Gap is the lack of large as well as big earthquakes in a particular place with a tectonic front. It is also an active fault which generally becomes the reason for other earthquakes.