If you want Brainiest answer then tell me what 1+0 is

Step-by-step explanation:

For an example,

You have a pet but your friend don't have a pet.

So think how many Pets are there?

The answer is 1.

Hope this helps you.

Have a nice day!

follow me ==> Hi1315

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!