A scuba diver wants to descend at an average rate of at least 7 feet per minute for 5 minutes. The table shows how many feet the scuba diver descends in the first 4 minutes. How many feet must the scuba diver descend in the fifth minute to meet the goal?

The scuba diver must descend 3 feet in the fifth minute to meet the goal.

Step-by-step explanation:

To find how many feet does the scuba diver need to descend to reach the goal of 35 feet in 5 minutes, we need to calculate how many feet he did descend on the first 4 minutes.

So, calculating we have:

First Minute = 9ft

Second Minute = 11ft

Third Minute = 5 ft

Fourth Minute = 7 ft

Total = 9 ft + 11ft + 5ft + 7ft = 32 ft

Goal = 35 ft

Needed = Goal - Total ( 4 minutes)

Needed = 35 ft - 32 ft = 3 ft

Hence, we can see that at the 4 minute, he has only descended 32ft. It means that he need to descend 3 feet more in the fifth minute.