(d) What is the derivative of 13(3)? L'(x) = (e) What is the critical number of L(:c}? critical number = (f) The dimensions of the garden that minimize the length of fencing are: ft by ' it. In the rst space, input the length of the fence that is parallel to back of the house. (5 points) A landscaper is to build a rectangular ower garden that has an area of 450 ft2. The back of the house is used as a side ofthe garden (no fence is needed along the back of the house). Note that the back of the house is 45 feet long. Let a: and y be the dimensions of the garden, where x is measured parallel to the back of the house, and let L be the length of fencing required. Answers the following: (3) Find a formula for L in terms of :n and y. Lisa) = ([3) Find a formula that expresses L as a function of :5 alone. 11(2) : (c) What is the domain of the function in part (b)? Express as an interval. Domain = (d) What is the derivative of M1)? 3(2) =