-15 + w = 6 can anyone help me out

Match the term on the left with its image or description on the right. match term definition diameter a) circle a and a line segment connecting points b and c which are on the circle. circumference b) circle a and a line segment connecting points b and c which are on the circle. radius c) a piece of the circumference of a circle secant d) two circles that share the same center. concentric circles e) the distance around a circle arc f) a segment between two points on a circle that passes through its center

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

What is the distance between point a and b