Let's begin by listing out the information given to us:
35 sections are up already
He adds 7 sections each Saturday
The equation to find the total number of fence sections F standing after any number of Saturdays s is given by:
![F=35+7s](https://img.qammunity.org/2023/formulas/mathematics/college/dfkodhq66oas4dwn7d0l8yaqsh0abahvdq.png)
Hence, option A is the correct answer