On a road, a bike sign in the shape of an isosceles trapezoid is to be painted. The sign and its dimensions are shown below. What is the area of the sign?

A right trapezoid is shown with a height labeled 4 feet and one of the bases labeled as 7 feet, and the other base is labeled as 5 feet.

24 square feet
28 square feet
32 square feet
36 square feet