19. Mr. Collins is constructing a fence around his property. He already has 35 sections up and plans to add 7 sections each Saturday until he is finished. Write an equation to find the total number of fence sections F standing after any number of Saturdays s.A. F= 35 + 7s C. F = 35 – 7s B. F = -35 – 7s D. s= 35 + 7F