The average cell phone bill per year was $650 in 2009. If the average cost each year is about 109.2% of the previous year (9.2% increase), what will a person pay total for
a cell phone for 2009-2018? (Round to nearest dollar.)

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

Someone which statements are true? check all that apply.