4. 60 metres of fencing will be used to enclose a rectangular garden. Let 𝑤 be the width of the garden.
4a) Find a function 𝐴 in the variable 𝑤 to give the area of the garden. (Hint: You need to find an area function 𝐴(𝑤) which only has the variable width 𝑤. There should not be a variable length 𝑙 in this formula.)
4b) Use your formula from part a) to evaluate 𝐴(20). What does this answer represent? Be specific.
2(w+𝑙) = 60 so
𝑙 = 30-w
A = w𝑙 = w(30-w)
Now finish it off