Mathematics
Grade6
Easy

Question

(b - 2) + a, where a = 7 and b = 8?

  1. 14    
  2. 15    
  3. 13    
  4. 0    

Hint:

This is an algebraic expression. An algebraic expression consists of two components: a variable and a constant. A variable is a quantity that doesn’t have any fixed value. It takes value according to the conditions. It is denoted by the alphabet. A constant is a quantity with a fixed value. In this question, value is assigned to the variables. We have to perform the required operations and find the final value.

The correct answer is: 13


    The given expression is (b-2)+a.
    There are two variables and one constant in the above expression. The variables are: ‘b’ and ‘a’. Values assigned to the variables are b = 8 and a = 7. We have to substitute these values and find the final value of the expression.
    There are three terms in the above expression. We will consider the bracket first. We have to subtract -2 from b and then add a.
    We have to first substitute the value and perform the required operations.
    To substitute the value, we have to replace b by 8 and a by 7. After substituting the value, we will get the following equation:
    (b-2)+a = [(8)-2]+(7)
    (b-2)+a = (6)+(7)
    (b-2)+a = 13
    Therefore, the value of equation is 13
    So option (c), which is ‘13’, is the right option.

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