The amount of gallons of water remaining in a swimming pool after x hours is given by the equation, y=-4000x + 20,000
What is the starting amount of water in the pool?
4,000
5,000
4,000
20.000

1 is c

2 is a

3 is a

step-by-step explanation:

is only a line? i think so

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

x = 3 ± √(5+y)