Mark is solving the following system.
ſ x+y+z= 2
3x+2y+z=8
4x-y-7z = 16
(1)
(2)
(3)
step 1: he multiplies equation (1) by 7 and adds it to equation (3).
step 2: he multiplies equation (3) by 2 and adds it to equation (2).
gp
which statement explains mark's mistake?

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

Which expression will have the same sum as 3_8 + 1/4?

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation