From sea level, a submarine descends 20 feet per minute. Where is the submarine in relation to sea level 5 minutes after it starts descending?
A. 20
B. 5
C. 100
D. -100
E. -20

Sample response: if the graph passes the horizontaline test, then the function is one to one. functions that are one to one have inverses that a therefore, the inverse is a hinction compare your response to the sample response above. what did you include in your explanation? a reference to the horizontal-line test d a statement that the function is one-to-one the conclusion that the inverse is a function done