Evaluating Expressions
 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 4yz - 5 if y = 2 and z = 10.4yz - 5 = 7. Evaluate y - z if y = -2 and z = -6.y - z = 8. Evaluate -a - b - ab if a = -3 and b = -4.-a - b - ab= 9. Evaluate -x - (-a + b)    if x = 2, a = -4 and b = -6.-x - (-a + b) = 10. Evaluate mx + b if m = -2, x = 4 and b = -3.mx + b = 11. Evaluate -(m + x)(-a + mx)      if m = 2, x = -3 and a = -4.-(m + x)(-a + mx) = 12. Evaluate -xa(x - a) + a      if x = 4 and a = -2.-xa(x - a) + a = 13. Evaluate x - xy if x = -2 and y = 3.x - xy = 14. Evaluate a - (ab - a) if a = -4 and b = -2.a - (ab - a) = 15. Evaluate x - ab(a - b)      if x = -3, a = -2 and b = -4.x - ab(a - b) = 16. Evaluate -xa(a + x) + x      if x = -4 and a = -2.-xa(a + x) + x = 17. Evaluate xm - 2m if x = -2 and m = -3.xm - 2m = 18. Evaluate 2abc - 3ab      if a = 2, b = -3 and c = 4.2abc - 3ab  = 19. Evaluate a2 - b if a = 4 and b = -8.a2 - b = 20. Evaluate a2 + b2 if a = -3 and b = -7.a2 + b2 =
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