First three itterations of g(x)=1/3x+1

What is the value of x? enter your answer in the box. (cm)

You’re repairing a large rectangular aquarium. the final step is to cover the glass with a protective film. the front and back of the aquarium measure 4 meters by 2 meters, and the sides of the aquarium measure 3 meters by 2 meters. how many square meters of protective film do you need? ( )

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76