12,500 / 100 = 125 125 x 4.5 = 562.5 562.5 x 4 = 2250
2250 + 12,500 = 14,750 He paid back a total of $14,750. Hope this helps :)
Answer:
=> Apply law of cosine

=> input value

=> simplify

=> calulcation

=> apply rule: Distance must be greater than 0
which is about 14.51828
3x -4 (5 - x) = 7x -20
3x-20+4x=7x-20
7x-20=7x-20
First, we need to get the total area of the rectangular pool.
Area = l * w
Area = 20 ft * 50 ft
Area = 1000 ft^2
Then the deck is 456 ft^2 with the width of 20ft, the same as the rectangular pool.
Area = l * w
456 = l * 20
l = 456 / 20
l = 22.8 ft.
So the walkway is 22.8ft wide.