Challenging problems
10. ten people form a circle. each one picks a number, and then each one announces the average
of the numbers of the two people next to them. the numbers announced by the 10 people are,
in clockwise order, 1, 2, 10. what is the number picked by the people who announces the
average 8?

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.

How can you check that you have correctly converted frequencies to relative frequencies?

What is solution for the following system of equations, 2x+8y=4 and x=-3y+5 1) x=14 y=-3 2) x=2 y=-3 3) x=-3 y=-3 4)x=12 y=5