Headphones are on sale for 20% off these headphones are $12 about how much will they be now

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

How is the equation of this circle written in standard form? x2 + y2 - 6x + 14y = 142 a) (x - 3)2 + (y + 7)2 = 200 b) (x+ 3)2 + (y - 7)2 = 200 (x - 6)2 + (y + 14)2 = 142 d) (x+6)2 + (y- 14)2 = 142

What is r i 4.5+10r=-6.5 with work pls