There are 3 books on the shelves and jake adds 5 more how many books are there on the shelve

This doesn’t make sense to me it’s supposed to be lcm ( least common multiple )

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%