Consider the universal relation r= {a, b, c, d, e, f, g, h, i, j} and the set of functional dependencies f.
f = {{a, b} _{c, d},
{d}=> {e, f, g},
{f, g}_{h},
{a}+{i},
{a, b} {e, g},
{a, i} + {i, j}}
(a) what is the closure of the set {a, d}?
(b) what is the key for r?
(c) what is the minimum cover for the set of functional dependencies f?
(d) decompose r into 2nf.
(e) decompose r into 3nf.

Acomputer has a two-level cache. suppose that 60% of the memory references hit on the first level cache, 35% hit on the second level, and 5% miss. the access times are 5 nsec, 15 nsec, and 60 nsec, respectively, where the times for the level 2 cache and memory start counting at the moment it is known that they are needed (e.g., a level 2 cache access does not even start until the level 1 cache miss occurs). what is the average access time?

Michael has written an e-mail to his employees that describes a new product special that will be introduced to the customers next week. by taking time to make sure the e-mail is well written, logical, and organized, michael has made sure his message has the characteristics of a) effective communicationb) ineffective communicationc) barriers to communicationd) workplace communication

What are the things you are considering before uploading photos on social media?