The rational function y=19800/x models the time, in hours, needed to fill a swimming pool, where x is the flow rate of the hose, in gallons per hour. three hoses – two with a flow rate of 400  gal/hr and one with a flow rate of 300 gal/hr – are used to fill the pool. what is the total flow rate if all three hoses are used? gal/hr

1100 gal/hr

Step-by-step explanation:

Given : Three hoses – two with a flow rate of 400 gal/hr and one with a flow rate of 300 gal/hr – are used to fill the pool.

To Find: What is the total flow rate if all three hoses are used? gal/hr

Solution:

Out of three,Two hoses with a flow rate of 400 gal/hr  each

So, flow rate of 2 hoses =

Third hose flow rate = 300 gal /hr

Now we are supposed to find the total flow rate if all three hoses are used

So, total flow rate = (300+800)gal/hr =1100 gal/hr

Hence the total flow rate if all three hoses are used is 1100 gal/hr

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d

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.