Directions: Simplify the following monomials (if possible).
1.) 17x - 25x
2.) -23y² + 6y²
3.) -15a³bc + 6a³bc
4.) 38x²y - x²y
5.) 2ab + 9ac

-ANYONE PLEASE HELP ME I REALLY NEED THE ANSWER RIGHT NOW BECAUSE I HAVE TO PASS THIS LATER I HOPE Y'ALL CAN HELP ME:(
I'LL MARK YOU AS THE BRAINLIEST!​