How do you turn 4 27/125 into a decimal?

Write 17/20 as a decimal and as a percent.

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?