When an individual passes the initial licensing test, a call sign is issued by the licensing authority, such as the FCC. When a US amateur advances to the General class, he may select to change his call sign by obtaining a variety of combination.
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You ignore the negative sign before it, if it has one.
minus
Find the square root of 23. The second one is the same number with a negative sign.
a equation
Yes, Coastguard 101