karen and bill collect coins. karen has x coins. bill has 2 coins fewer than four times the number of coins karen has. Write and simplify an expression for the total number of coins karen and bill have.

I’m really confused and need to learn this

Which of the following is the major negative aspect of crossover designs for research studies? a. prohibitive cost b. residual effects c-subject drepout d. incomplete randomization e. large sample size required

The room above is shaped like a rectangle and has a perimeter of 34 feet. if the room is 11 feet long, how wide is it?