Question

one way the engineers scale differs from the architectural scale is that the former _____.
it is based on units of 10
uses fractional values
only used for machine drawings
cannot be used to measure long distances

Explanation:

Engineer's scale is based on units of 10 (e.g., 1:10, 1:100 etc.), while architectural scale has different unit - based systems like 1/8" = 1'-0" etc.

Answer:

It is based on units of 10