I need help i attach a photo of the math ​

Asap will give brainliest and a lot of points

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

Me. i can't figure out this question. give an explanation too. .