Equivalent expression standard form of (2x+5)(x+1)

Josephine has a great garden with and area of 2x2 + x - 6 square feet

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?