Which statement must be true?
a. a statement cannot become a proof until it is a theorem.
b. a statement cannot become a theorem until it becomes a postulate.
c. a statement cannot become a theorem until it is proven.
d. a statement cannot become a postulate until it is proven.

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.

Witch represents the inverse of the function f(x)=1/4x-12

Solve the system of equations. 2x-2y=-4 and x+y=8. show work