I need some help plz answer!

please answer both of these problems, they are really confusing

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

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?

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52