In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Southern moles are six to _ inches long and weigh three to four ounces.
[A]: seven


[Q]: Calves grow quickly and are weaned from their mothers in only _ to four months.
[A]: three


[Q]: Octagons have a centered symmetry with _ axes.
[A]:
eight