The sum of a number (n) and 20 is 55. which equation shows this relationship?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

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?

Which graph represents the given linear function 4x+2y=3