Answer:
toString is right Answer
Explanation:
If you want to represent any object as a string, toString() method comes into existence.
The toString() method returns the string representation of the object.
If you print any object, java compiler internally invokes the toString() method on the object. So overriding the toString() method, returns the desired output, it can be the state of an object etc. depends on your implementation.
Answer:

Explanation:
In order to obtain the decimal number we have to use the next formula:

(The position to the right of the decimal point we will take it as negative)
Using the formula we have:


Answer:
Multiple-user licence.
Explanation:
A multiple-user licence allows the software to be accessed by the maximum number of users specified within the licence. In this scenario, it is 5 students, the connections are concurrent, meaning at any given time there can only be five users running the software. The software can be installed on more than 5 computers, but the number of active users is limited to 5.