In 2009, Peter earned 15,000 USD working part time as a taxi driver. He also earned 200 dollars a week working as
a math tutor for 20 weeks. Finally, peter earned 50
dollars of interest income from a saving account

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?