Calculate the distance between (-2-2i) and (-4-5i) on the complex plane

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 equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4

How to do this , and can some one explain