NCTI Field Tech II to III Practice Exam

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If x = 3, what is the value of the expression 2x + 7?

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13

To find the value of the expression 2x + 7 when x = 3, start by substituting 3 for x in the expression.

First, calculate 2 times x:

2 * 3 = 6.

Next, add 7 to this result:

6 + 7 = 13.

Therefore, the value of the expression 2x + 7 when x equals 3 is 13. This confirms that the answer is correct, as it directly results from substituting the given value into the expression and performing the arithmetic operations accordingly.

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