Josh’s monthly rate for his cellphone is very low, but he is limited to the number of texts he can send before he has to pay extra. Marley has a monthly plan that includes unlimited texting. She pays $39.95/month for her phone. Josh is trying to decide whether he should switch plans. The chart shows Josh’s monthly charges for the last six months. Determine the MEAN additional charges

June

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: 1 and 3

step-by-step explanation: