Adecorative floor pattern has one red square tile surrounded by 12 blue titles. write and evaluate an expression to show how many tiles (red and blue) are needed if there are 15 red tiles if there are titles 15, 20, 25 or 30 red tiles.

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!