What is the area of the polygon?

The trick here is to subdivide this polygon into smaller polygons whose areas are easier to find.  To help you get started:

Consider drawing a vertical line thru x=-1.  Then you'll have a trapezoid on the left of this vertical line.  The area of a trapezoid is

 l1 + l2                                             5+3
* 5.  More specifically, A = * 5 = 4*5 = 20 square units.  
     2                                                  2

On the right side you'll see 2 triangles:  One has a height of 4 and a base of 2.  The other has a height of 4 and a base of 3.  Area of a triangle is (1/2)(base)(height).

Sum up the areas of these three subareas of the original figure.

Here’s the answer. you’re supposed to use 2900 times the interest rate and then add your original amount of money. now you get 2997.15

Provide an equation