Shondra bought a spool of ribbon. she uses 30 inches of the ribbon to decorate each gift box. she decorated 7 gift boxes in all. what number describes the change in length of ribbon on the spool?

210 inches less

Step-by-step explanation:

Shondra bought a spool of ribbon.

She uses 30 inches of the ribbon to decorate each gift box.

She decorated 7 gift boxes in all.

She used total ribbon = 30 × 7 = 210 inches

The change in length of ribbon is 210 inches less from the spool.

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!