Please show all work and define all variables if necessary.

Part 1: Multiple Choice: Circle the correct response. (2 points each) 1. For which set of values of x is the algebraic expression - x -16 undefined? x -4x-12 A) (-2, 6} B) (-4, 3) C) {-4, 4) D) {-6, 2} 5 2. Find the least common denominator for the following rational expressions: 6ab3' 2a 462 A) 120263 B) 120365 C) 480365 D) 240363 20x -10x? 3. Simplify A) 2x B) 2x13 C) 4x - 2x3 * IN Part 2: Tell whether the statement is SOMETIMES, ALWAYS, or NEVER true. (1 point each) 4. The sum of two rational expressions is sum of the numerators over the sum of the denominators. 5. The LCD of two rational expressions is the product of the denominators. 6. When multiplying rational expressions, you need to make sure they have a common denominator. 7. When adding rational expressions, you need to make sure they have a common denominator. Part 3: Free Response: Show all work to receive full credit. Find the expression that makes the following statement true. (3 points) 8. x - 4x x2+3x-4 x+4 2x - 8x 2