#16 write the equation of the circle

need

Find the sum of the following series. round to the nearest hundredth if necessary.

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels