Im jus starting this math and ifk how to do iy

What is the length of an with endpoints a 3,2 and b 8,14

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

What is the value of x when x + 7 = 21?