A variable is a letter that represents an unspecified number. Substitute a number for each variable and perform the arithmetic operations in order to evaluate the expression.
For instance, to evaluate the expression x² + 2x - 3y for x = 1 and y = 2, calculate the expression by substituting the given x and y:
x² + 2x - 3y = 1² + 2×1 - 3×2 = 1 + 2 - 6 = -3.




Evaluate each expression below if a = 4, b = 2 and c =-1:

Question 1:



4


6


9








Question 2:



16


21


24


29





Question 3:



8


-10


-2


-6





Question 4:



0.5


2


0.4


3.5





Question 5:



385


401


423


459




Question 6:



88


94


98


102




Question 7:



0.675


0.75


0.875


0.925





Question 8:



0.5


0.6


0.7


0.8





Question 9:



-3.2


-3.6


-3.9


-4.3




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