Directions:Simplify the following monomials.
1.) -3a + 52a
2.) -12x²y - 3x²y
3.) 16ab³ - 43ab³
4.) -15m - ( -15m)
5.) 11c²d² - 20c²d²

ANYONE PLEASE HELP ME BECAUSE I HAVE TO PASS THIS TOMORROW MORNING AT MY 1ST CLASS,I HOPE Y'ALL CAN HELP ME I REALLY NEED THE ANSWER RIGHT NOW:(
I'LL MARK YOU AS THE BRAINLIEST:)​