I WILL GIVE 20 POINTS PLUS IM GIVING BRAINLIEST

What is the common denominator for 3/5+3/4

Can someone answer it, and plot it, for 20 points and brainliest answer? p. s. they're the same ! : )

Iwill give brainliest only if your correct the words subsequent and submerge both contain the prefix sub. based on this information, what does the prefix sub most likely mean? a) under or secondary b) true or verifiable c) tricky or difficult d) around or centered on