Simplify: (4 – 5) – (13 – 18 + 2). Options.
A) -1 B) –2 C) 1 D) 2 E) 0
Solution:   (4 – 5) – (13 – 18 + 2).   = -1-(13+2-18).   = -1-(15-18).   = -1-(-3).   = -1+3.= 
<gadget id="calculator">-1+3.</gadget>
<output>2</output>
2.   Answer: (2)
<result>D</result>
Simplify: (4 – 5) – (13 – 18 + 2).