Evaluate the following expressions at given value of the variable $.$
$23 - 4 r$ when $r = 3$

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Solution

We want to find out the value of the expression $23 - 4 r$ when $r = 3$
Put the value of $r = 3$ in the given expression $.$
$= 23 - 4 r$
$= 23 - 4 \times 3$
$= 23 - 12$
$= 11$
Hence $,$ the value of $23 - 4 r$ when $r = 3$ is $11$ .

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