Researchers safely captured 16 river dolphins and placed a painless tag under their flippers. These river dolphins were quickly returned to the water. Two weeks later, the researchers captured 21 dolphins and found that 3 of them had already been tagged. Estimate the number of river dolphins in the Amazon River. Set the problem up as a proportion with a variable and solve.
(I got this math question and I can't even understand it at all please please help)

you should at least use a calculater

step-by-step explanation:

215.92 dollars is the answer

easy its decreasing

step-by-step explanation:

because its top point is at the to of the graph on the left side (atleast from the veiw i see it) now if that top point wast in the lower part of the graph it would be increasing hope this have a nice day

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.