Help answer 7, 8 and 9 for brainlst

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Which math sentence can be used to determine if the triangle is a right triangle?

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?