The expression −380+13y represents a submarine that began at a depth of 380 feet below sea level and ascended at a rate of 13 feet per minute. What was the depth of the submarine after 9 ​minutes?

step-by-step explanation:

cats

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step-by-step explanation:

h is the x-coordinate of the vertex

step-by-step explanation:

we have

in this function

the point represent the vertex of the function

so

h is the x-coordinate of the vertex

k is the y-coordinate of the vertex