The graph of y= |x| is scaled vertically by a factor of 7/2

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.

What is the number 321,000,000 in scientific notation? also what is the number? ?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?