Perform the specific elementary row operation and type the resulting system of equations. In the space provided, type the answer without any spaces between the letters, numbers, or symbols.
-x + y - Z= 10
3x - 2y + 6 z = 4
x + 2y + Z=5
(Eq) + (Eq3) (Eq3)

What is the value of x? enter your answer in the box. (cm)

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.

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling