a pair of socks is purchased at wholesale for $2.00.it is then sold for $4.00 to the customer. what is the percent increase?

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The equation |pl = 2 represents the total number of points that can be earned or lost during one turn of a game. which best describes how many points can be earned or lost during one turn? o o -2 2 oor 2 -2 or 2 o