Decide whether or not each equation represents a proportional relationship. type yes or no. hint: look at the equation. volume measured in cups (c) vs. the same volume measured in ounces (z): c = 1/8z area of a square (a) vs. the side length of the square (s): a = slatex: ^22 perimeter of an equilateral triangle (p) vs. the side length of the triangle (s): 3s = p length (l) vs. width (w) for a rectangle whose area is 60 square units: l = 60/w

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.

he earned 78.75 in interest.

step-by-step explanation: