Awell-mixed lagoon with volume 1,500 m has been received a steady flow of a conservative waste at a rate of 120 m3/day for a long enough time to assume that steady- state conditions apply. the waste entering the lagoon has a concentration of 12 mg/l. i. what is the concentration of pollutant in the effluent leaving the lagoon? ii. if the input waste concentration suddenly increases to 120mg/l, what would the concentration in the effluent be 7 days later?

x/7.50 = 15

x= 7.50 / 15 divide

step-by-step explanation:

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answer: for each 3 girls there is 2 boys . 3: 2

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answer: the price of one pound cabbage = $ 0.8

the point (10,8) represents that the cost of 10 pounds cabbage is $ 8

step-by-step explanation:

since, here is a proportional relation between the number of pounds of cabbage (x) and the price in dollars (y).

therefore, we can write,

⇒ y = k x

where k is the constant of proportionality.

now, point (5,4) is in the line.

thus, it will satisfies the above equation of line.

⇒ 4 = 5 k

⇒ k = 0.8

thus, the equation of the line is,

y = 0.8 x

a) for x = 1,

y = 0.8

therefore, the cost of one pound of cabbage is 0.8 dollars.

b) in the below graph (10,8) represents that the cost of 10 pounds of cabbage is 8 dollars.