I need answer please

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32