\begin{tabular}{|c|c|c|c|}
\hline
System & Key Word & SYSTE & \\
\hline
& Air & Oxygen & \\
\hline
b. & Land & & Mountains \\
\hline
Hydrosphere & & Ocean & \\
\hline
\end{tabular}

(Please ensure the headings and content of your table are correctly labeled and complete for clarity.)



Answer :

Sure! Here is the detailed, step-by-step solution to the problem:

We start by considering that there is an initial number of computers in the server room.

1. Initial Number of Computers:
- There were initially 9 computers in the server room.

2. Number of Computers Installed Each Day:
- Each day, an additional 5 computers are installed.

3. Number of Days:
- The installation happens over a period of 4 days (Monday to Thursday).

4. Calculating the Total Number of Computers Installed:
- To find the total number of computers installed over the 4 days, we multiply the number of computers installed per day by the number of days:
[tex]\[ 5 \text{ computers/day} \times 4 \text{ days} = 20 \text{ computers} \][/tex]

5. Final Number of Computers in the Server Room:
- To find the total number of computers in the server room at the end of the period, we add the initial number of computers to the total number of computers installed:
[tex]\[ 9 \text{ initial computers} + 20 \text{ installed computers} = 29 \text{ computers} \][/tex]

Hence, the total number of computers installed over the days is 20, and the final number of computers in the server room is 29.