0.02x+x Simplify the expression

Which of the following can be used to explain a statement in a geometric proof?

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?

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get