Step-by-step explanation:
The third option: 5x(x^2+3)(4x-5)
because FOIL first, inner, outter, last
The two parentheses become (4x^3-5x^2+12x)
then 5x outside multiplys that whole parentheses. To get your correct expression
344444444;3333333+5655434455432=45666788999765433
Total length of fence = 420 feet
To fence 3 sides with max area = 420 ÷ 3 = 140 feet
Each side should should be140 feet
Total enclosed area = 140 x 140 = 19600 square feet.
It’s 6 because the full length is 12 and it’s asking for the half of it