Which of the following is a perfect square? 18 81 50 32

The correct answer is 81

Step-by-step explanation:

Here are all the perfect squares.

1 21 × 11

2 22 × 24

3 23 × 39

4 24 × 416

5 25 × 525

6 26 × 636

7 27 × 749

8 28 × 864

9 29 × 981    81 Is a perfect square!

10 210 × 10100

11 211 × 11121

12 212 × 12144

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step-by-step explanation:

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.