What does it mean if a particle has a charge of 0

The parking lot of a store has the shape shown. all angles are right angles. what is the area of the parking lot?

What is the rescursive formula for this geometric sequence? 7, -14, 28, -56

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.