If x= 4, which of the following expressions does NOT equal 9?

When evaluating the expressions given the value of ( x = 4 ), we can substitute ( x ) into each option to see the resulting value.

For the first expression, substituting ( x ) gives:

[

x + 5 = 4 + 5 = 9

]

This expression equals 9.

The second expression is calculated as follows:

[

13 - x = 13 - 4 = 9

]

Again, this expression equals 9.

The third expression becomes:

[

2x + 1 = 2(4) + 1 = 8 + 1 = 9

]

This one also equals 9.

Finally, for the fourth expression, substituting ( x ) results in:

[

3 - x = 3 - 4 = -1

]

This expression does not equal 9.

The only expression that does not yield a result of 9 when ( x = 4 ) is the fourth option, which evaluates to -1. This is why that expression is identified as not equating to 9.