+ is used to mean positive. No sign on a number also means the number is positive. Example +5 = 5 .
A negative enthalpy of formation indicates that energy is evolved.
An exponent
The square root sign is called a radical
A river mouth is a portion of a stream where it merges with another stream. Note that here the definition of stream is not "a small river", but "any flowing current within well defined banks."
An arrow that intersects with an arrow coming from the side
The Quickening
They should do, yes.
As an ICT professional there are many cultural issues which may impact if organisation merges with another. For instance it may arise of cross cultural issues, the tradition of doing their jobs.
Advisory speed sign
True
Plus sign
plus sign
It indicates helping and saving sign
Tributary when one river flows into another or if more than one river merges to form another - Confluence
Intensified sedation is a sign that indicates the ombined use of alcohol and narcotics.
A sign that foul weather is approaching on a boat could be rolling thunder or darkening clouds. Another sign might be the waves picking up and getting bigger.