This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.
ScanSolve AI Answer
19. Solve the inequality: |2x + 1| > 3 ✅ Correct. The steps taken to solve the absolute value inequality are correct, leading to the solution x > 1 or x < -2. 20. If A B and B A, then: ❌ Incorrect (notation error in explanation, but final answer is correct). The definition of a subset is A B, not A B. The statement "A B means that every element in set A is also an element in set B" is incorrect notationally. It should be "A B means that every element in set A is also an element in set B." However, the conceptual understanding that if A B and B A, then A = B is correct.