Define a variable and write an equation to find each number. Then solve. Thirty less than two times a number equals four times the number. What is the number?

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

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.

Through non-collinear points there is exactly one plane.