I’ve been stuck on this question and can’t seem to figure out how to do it

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

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.

Felix wrote several equations and determined that only one of the equations has no solution. which of these equations has no solution?