A data set is made up of these numbers 4 6 7 8 9 12 15
what is the interquartile range

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

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.

Can someone answer this question? : )