The weight of 1m^3 of air is approximately 1.3×10^3g. suppose that the volume of air inside of a building is 3×10^6 m^3. how much does the air inside the building weight?

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.

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?