Ashley has decided to participate in sit-up challenge. The first day she will complete sit-ups. Every day she will do twice as many sit-ups as the day before. The function can be used to to determine how many sit-ups she will do on day x of the challenge.

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!

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction