Directions: Simplify the following monomials (if possible).
17.) Subtract 9a from -15a
18.) From -9cd², subtract -2cd²
-ANYONE PLEASE HELP ME I REALLY NEED THE ANSWER RIGHT NOW BECAUSE I HAVE TO PASS THIS LATER AT 5PM AND IT'S ALREADY 4:25PM I HOPE Y'ALL CAN HELP ME:(
I'LL MARK YOU AS THE BRAINLIEST!
