:A rational number, if it is subtracted from its additive inverse, the result will be what is the number?

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.

15/16 as a decimal rounded to the nearest hundredth

Find the value of x. round the length to the nearest tenth