in a rectangular coordinate system, what is the area of a rectangle whose vertices have the coordinates ( - 4, 1 ), ( 1, 1 ), ( 1, - 3 ) and ( - 4, - 3 )?  Choose the correct answer:
A) 16
B) 20
C) 24
D) 25
E) 30
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>B</result>
in a rectangular coordinate system, what is the area of a rectangle whose vertices have the coordinates ( - 4, 1 ), ( 1, 1 ), ( 1, - 3 ) and ( - 4, - 3 )?
multiply(add(4, 1), add(1, 3))
"length of side 1 = 4 + 1 = 5 length of side 2 = 3 + 1 = 4 area of rectangle = 5 * 4 = 20 b is the answer"