An ecologist captured and marked 75 snails with nail polish. One month later, the ecologist found 45 snails with nail polish out of the 90 snails that were caught. What is the estimated total population size?

The estimated total population size is 150.

Step-by-step explanation:

Given:

An ecologist captured 75 snails and marked with nail polish.

After one month, the ecologist caught 90 snails and found 45 snails with nail polish that were caught.

Now, to calculate the estimated total population size of snails.

Marked snails with nail polish () =

Total snails caught after 1 month () =

Snails found after 1 month with nail polish () =

Now, to get the estimated total population size we put formula:

Therefore, the estimated total population size is 150.

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

452,489 to the nearest thousand is 452,000