A quantity with an initial value of 400 decays exponentially at a rate such that the quantity cuts in half every 10 years. What is the value of the quantity after 54 months, to the nearest tenth?

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need