Hello, Looking for guidance on how to solve these types of problems for my most recent math lab.

Any assistance is greatly appreciated!

You are designing a rectangular poster to contain :18 in2 of printing with a 3-in margin at the top and bottom and a 1in margin at each side. What overall dimensions will minimize the amount of paper used? What is the vertical height of the poster that will minimize the amount of paper used? h= in What is the horizontal width of the poster that will minimize the amount of paper used? W: in