Y=3^x graph and table

Which expression is equivalent to 4 square root 6 divided by 3 root 2

At which value in the domain does f(x) =0?

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?