Simplify this using the imaginary i

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?