Find the total surface area of the shape

Which of the following situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

What is the value of x in the diagram below?

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.