Why can't someone me out? i don't understand the shading

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Which of the following would be a correct step in proving that triangle abc is congruent to triangle cda? a. use a protractor to measure the angles and show that all the corresponding angles are equal in measure. this will allow you to prove congruence by aaa. b. show that segment ab is parallel to segment cd and segment ad is parallel to segment cb. this will allow you to prove congruency by asa. c. show that is segment ab is perpendicular to segment ad. this will allow you to prove congruence by sas. d. none of the above.