Answer :
Final answer:
A nominal 8 x 8 x 16 concrete block is typically slightly smaller than its nominal dimensions to account for the addition of mortar in construction, making option a), 7.5 x 7.5 x 15.5, a common approximation of its actual size.
Explanation:
A nominal 8 x 8 x 16 block is often not exactly those dimensions due to the nominal sizing used in construction, where the actual measurements account for mortar lines or material shrinkage. The question seems to refer to concrete blocks, which are typically slightly smaller than their nominal dimensions to ensure they fit correctly in construction projects with the addition of mortar.
However, without additional context of the standards used for the sizing of such blocks (as it can vary by region or standards organization), it's difficult to provide an accurate answer. Typically, a nominal 8 x 8 x 16 block would actually measure slightly less in each dimension, so option a), 7.5 x 7.5 x 15.5, is often the closest approximation to the actual size given the common allowance for mortar. Nevertheless, this answer makes an assumption based on typical construction practices, which may not apply in every case.
