What is the value of f(4) when f(x) = 2x + 6

99 points at a zoo, the leopard pen has a ring-shaped sidewalk around it. the outer edge of the sidewalk is a circle with a radius of 12 m. the inner edge of the sidewalk is a circle with a radius of 8 m. (1 point for showing all of your work) a. write and simplify an expression for the exact area of the sidewalk. (1 point for the answer) b. find the approximate area of the sidewalk. use 3.14 to approximate π. (1 point for the answer)

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

Having a hard time understanding this question (see attachment).