3.1 Practice

The graph shows that while it was being filled, the amount of water in gallons in a swimming pool was approximately proportional to the time that has passed in minutes. About how much water was in the pool after 25 minutes?

• About 380

• About 300

• About 400

• About 410

The graph shows that while it was being filled, the amount of water in gallons in a swimming pool was approximately proportional to the time that has passed in minutes. Approximately when were there 500 gallons of water in the pool? About ______ minutes?

The graph shows that while it was being filled, the amount of water in gallons in a swimming pool was approximately proportional to the time that has passed in minutes. Estimate the constant of proportionality for the number of gallons of water per minute going into the pool.

If the area of the small square is A, what is the area of the large square?

If the diagonal of the small square is d, what is the diagonal of the large square?

If the side length of the small square is s, what is the side length of the large square?

Select all quantities that are proportional to the diagonal length of a square.

• Area of a square

• Perimeter of a square

• Side length of a square

Estimate the side length of a square that has a 9 cm long diagonal.