(pay attention to the nimbers) A submarine must descend at an average rate of at least 10 feet per minute for 5 minutes. The table shows how many feet the submarine descends in the first 4 minutes. How many feet must the submarine descend in the fifth minute? (show your work)

   Submarine must descend by 12 feet in the fifth minute.

From the table given in picture,

Let the distance descended by submarine in 5th minute = x feet

Average distance descended by the submarine = [tex]\frac{\text{Total distance distended}}{\text{Duration or time}}[/tex]

                                                                                = [tex]\frac{8+10+8+12+x}{5}[/tex]

                                                                                = [tex]\frac{38+x}{5}[/tex] feet per minute

Statement given in the question → "Submarine must descend at an average rate of at least 10 feet per minute"

So the inequality for the statement will be,

[tex]\frac{38+x}{5}\geq 10[/tex]

38 + x ≥ 50

x ≥ 50 - 38

x ≥ 12

    Therefore, submarine must descend 12 feet in the 5th minute.

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