It it a function WHY OR WHY NOT

No, it does not represent a function because if you did the vertical line test it would pass through the line more than once which means a input could have more than one output therefore it is not a function.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.