(1 point) a fish tank initially contains 15 liters of pure water. brine of constant, but unknown, concentration of salt is flowing in at 5 liters per minute. the solution is mixed well and drained at 5 liters per minute. a. let x be the amount of salt, in grams, in the fish tank after t minutes have elapsed. find a formula for the rate of change in the amount of salt, dx/dt, in terms of the amount of salt in the solution x and the unknown concentration of incoming brine c. dx grams/minute b. find a formula for the amount of salt, in grams, after t minutes have elapsed. your answer should be in terms of c and t. x(t)= grams c. in 10 minutes there are 25 grams of salt in the fish tank. what is the concentration of salt in the incoming brine? c = g/l

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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  the correct choice is marked

step-by-step explanation:

the first two graphs show multiple turning points. the last graphs matches the description in every detail.

school a:

minimum value is 2

maximum value is 22

the lower quartile is 2.5

the median is 10

the upper quartile is 15.5

school b:

minimum value is 9

maximum value is 20

the lower quartile is 12

the median is 16

the upper quartile is 18

box plot for school a isn't symmetrical. the data tails on the right

box plot for school b isn't symmetrical. the data tails on the left

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-lavira: )