Answer:
d. A subclass reference can be assigned to a superclass variable, but a superclass reference cannot be assigned to a subclass variable.
Explanation:
A subclass is a class which is derived from another class. A subclass will have the characteristics of its ancestor class. A superclass is a class which is class direct ancestor. A superclass is an existing class from which new classes are derived whereas subclass is a class which is derived from superclass. The correct statement is that a subclass can be assigned to a superclass variable.
Answer:
copy and paste
Explanation:
highlight, right click, then go to where you want it, then right click again, and paste. and done
we will write year in column B and column c respectively
2017 and 2018
then we will add months of year from January to December in the cells range from A2 to A13
then we will choose cell g5 and will write the diffrence formula
g5=attendance of 2018 - attendance of 2017"
we put "=" sign to put an formula in excel
then finally we will use fill handle and drag it from g6 to g12
to copy the difference formula
look at attached file
The five main parts of a system are:
1. The CPU
The CPU is the brain of the computer. It is the main part that does all th thinking and processing.
2. RAM
which stands for Random Access Memory. As implied in its name, it can be accessed at random times by the CPU. When you open a program, all the scripts and codes that are running need to be run of a separate memory bank. Thus, the RAM takes part.
3. Drives
Hard Drives, SSDs, USB Drives, and SD cards are all forms of main computer memory. That is where the computer stores the OS, your files, and its instructions.
4. Inputs/Outputs
By inputs and outputs i mean hardware, like Speakers (ouput), Monitors (output), Keyboard (input), and Mouse (input).
5. OS
The OS is the Operating System (e.g. Windows, Linux, Mac), which is the main instructions for the computer. It is what makes your computer usable.
Answer:
keeping software programs up-to-date
Explanation:
