Find a number which when divided by 3 is equal to sum of the number and 2

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4