Answer:
-11
Step-by-step explanation:
(a+b) +(c+d)
plug in
(-5+15)+(-9-12)
type in calculator
you will get your answer (-11)
-11 (b)
Well basically plug the numbers into the equation. Than solve.
So (-5 + 15) + (-9 + -12) is what you get when you plug in the values. Than do the math. 10 + -21 = -11
There you go. Hope this helped.
