Answer
The length of each subinterval $=∆x=\frac{1}{2}$, OR $∆x=0.5$
Work Step by Step
Consider the interval $[4,18]$ is partitioned into $n=28$ subintervals.
Now, we have to find the subinterval length $∆x$.
The lenght $∆x$ of each subinterval is given by,
$∆x=\frac{b-a}{n}$
where, $a=4, b=18$ and $n=28$.
By putting values , we get,
$∆x=\frac{18-4}{28}$
$=\frac{14}{28}$
$∆x=\frac{1}{2}$
Hence, the length of each subinterval $=∆x=\frac{1}{2}$, OR $∆x=0.5$
