List all of the terms of the expression. List the like terms of the expression. List the coefficients of the expression. List the constants of the expression.
A shipping company charges x dollars to ship a package that weighs up to 1 pound and an additional fee based on the additional weight of the package.
Write and simplify an expression that represents the total cost of shipping 2 packages that each weigh 0.75 pound, 3 packages that each weigh 2.5 pounds, and 1 package that weighs 4.2 pounds.