Expression in simplest form that represents the perimeter of a polygon that is 8cm 9x 8cm 9x

Answer 1

Hard to tell just what you meant, but just adding what you wrote (assuming all dimensions are in cm), then

p = 8 + 9x + 9 + 9x = 16+18x

...

Answer 2

Each runner is carrying an 8 ounce bottle of water, a 2.1 ounce energy bar,
and a 3 ounce energy drink. Write an expression in simplest form that
represents the weight carried by y runners. Interpret the expression.