100 pointsi'm adding an attatchment so don't start answering yet

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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?