From the question, we are informed that the addition to the deck at the back of Kristan house was 7 feet 11 inches on one side and 8 1/2 feet on the other.
To get the total length of saftey rail that they should buy, we would add the value given together. This will be:
One expression could be.... Nine times 4 plus five equals forty one. ALSO... Eight times eight equals sixty four then subtract twenty four equals forty one
