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1. Evaluate a + b if a = 7 and b = 3. a + b = 2. Evaluate a - b if a = 8 and b = 2. a - b = 3. Evaluate ab if a = 3 and b = 5. ab = 4. Evaluate 2a + b if a = 4 and b = 8. 2a + b = 5. Evaluate abc if a = 4, b = 5 and c = 2. abc = 6. Evaluate 4y - 5 if y = 2 4y- 5 = 7. Evaluate y - z if y = 37 and z = 6. y - z = 8. Evaluate mx + b if m = 2, and x = 4 mx + 7 = 9. Evaluate a2 if a = 9 a2 = 10. Evaluate a2 + b2 if a = 3 and b = 7. a2 + b2 = |