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Answer:
48. b
49. c
50. d
Step-by-step explanation:
For number 48, you are looking for the correct solution. If x = 5 then 4(5) - 8 = 12, which will make the statement true now.
For number 49, if you try to solve the equation you will find out that -3 (-6 + 2) is equal to 12. and because 12 is not less than 10 this statement is not correct.
For number 50, it is called a solution set because one value inside a solution set can make the statement true. For example, in number 48 you have to solve the equation with a solution set of {3, 5, 7, 9}. Because one of these numbers is correct it is considered a solution set now.