Which of the following is a function?
1. input output input output input output
2 5 2 4 1 1
3 5 3 6 2 2
4 5 3 8 2 2
5 5 5 10 1 1

To be a function for each input you can only have one output.

First line, you have 2 inputs of 2, but each one has a different output, so is not a function.

Second line has 2 inputs of 3, but each one has a different output, so is not a function.

The fourth line has two inputs of 5's but each one has a different output, so can't be a function.

The answer is: 4 5 3 8 2 2

what is the answer?

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.