Does it equal 7,140 and did i stack it right

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

If square root x = -7, then x= -49 true or false

What is coefficient of the term of degree of degree 5 in the polynomial below