Coordinates are given as ordered pairs, with the coordinate on the x-axis first and the coordinate on the y-axis second. If both numbers are positive, the coordinate is in the first quadrant. If the first is negative and the second is positive, the coordinate is in the second quadrant. If both numbers are negative, the coordinate is in the third quadrant. If the first number is positive and the second is negative, the coordinate is in the fourth quadrant. The ordered pair (2, 1) refers to a point that is 2 away from 0 on the x -axis and 1 away from 0 on they -axis. It is in the first quadrant. Which of these ordered pairs describes a coordinate in the third quadrant?

A
(3, 5)

B
(-3, 5)

C
(-3, -5)

D
(3, -5)

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.