A die is rolled 100 times. A 1 was rolled 14 times, a 2 was rolled 12 times, a 3 was rolled 15 times, a 4 was rolled 18 times, a 5 was rolled 19 times, and a 6 was rolled 22 times. What is the experimental probability of rolling a 4?

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?