The expression -50x + 100 represents the balance, in dollars, of a bank account after x months. What is the rate of change, in dollars per month, of the bank account balance ?

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's