The frame, around the outside of windowpanes, is two inches in width. The frame's cross, in the middle of the window frame, is one inch wide. Priya wants to write a function to customize the measures of the
window depending on the length of a side of a single windowpane. She labels the side of a
windowpane, x.
1. Write a function f(x) to equal the side length of the entire window, including frame widths.