if $f(x)=lceil x\rceil - 5$, what is $f(8.6)$?\n3\n4\n8\n9

Explanation:

Step1: Evaluate the ceiling function

The ceiling function $\lceil x\rceil$ of $8.6$ is $9$ since it gives the smallest integer greater than or equal to $x$. So, $\lceil8.6\rceil = 9$.

Step2: Substitute into the function

Substitute $\lceil8.6\rceil = 9$ into $f(x)=\lceil x\rceil - 5$. Then $f(8.6)=9 - 5$.

Step3: Calculate the result

$9-5 = 4$.

Answer:

4