GIVING BRAINLIEST TO RIGHT ANSWER (WILL CHECK IF CORRECT) Which of the following shows the correct first step to solve x^2-16x=-21 by completing the square?

A) x^2 - 16x + 8 = -21 + 8
B) x^2 - 16x + 64 = -21
C) x^2 - 16x + 16 = -21 + 16
D) x^2 - 16x + 64 = -21 + 64

Which graph represents y=^3 sqrt x+8-3 ?

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)