9,6^2+18,8^2=X^2
92,16+353,44=X^2
X^2=445,6
X=21
There is a rule:
One input(x-value) can only have one output(y-value) in order to be a function.
If one input has more than one output, it is not a function.
(This doesn't apply to outputs, one output can have more than one input and still be a function)
The 1st option is not a function because the inputs 9 and 10 have more than one output.
The 2nd option is not a function because the input 3 has more than one output.
The 3rd option is a function because each input only has one output.
The 4th option is not a function because the input 5 has more than one output.
D: because if you take 9.50-7.50=2 you would get p=price or the price of the pen.
Hope I helped=)
X=147
Angle x and 33 are a linear pair meaning they equal 180 and 180-33=147
