Question

the value of the expression $5n - 18$ when $n = 7$ is ______

Explanation:

Step1: Substitute n = 7 into the expression

We have the expression \(5n - 18\). Substitute \(n = 7\) into it, so we get \(5\times7 - 18\).

Step2: Calculate the multiplication first

According to the order of operations (PEMDAS/BODMAS), we first calculate the multiplication. \(5\times7 = 35\), so the expression becomes \(35 - 18\).

Step3: Calculate the subtraction

Now we calculate \(35 - 18 = 17\).

Answer:

17