If there are no repeating x values and an x value only goes to <em>one</em><em> </em>y value, then yes, it is a function.
Answer:

Step-by-step explanation:
-A rectangle's area is given by:

Given A=
and
, we substitute in the formula to solve for the width as follows:

Hence , the rectangle's width is 
2(3+3) or 2(3)+6, so the answer is the third option. It’s just using the distributive property.
Answer:
37
Step-by-step explanation:
35^2+12^2=1369
√1369=37