To solve the given problem, we can use the information provided:

• Each notebook costs $250.
• Each desktop computer costs $375.

1. Total cost for 17 notebooks and 18 desktop computers:

For 17 notebooks, the total cost is: $17 \times 250 = 4250$

For 18 desktop computers, the total cost is: $18 \times 375 = 6750$

So, the total cost for 17 notebooks and 18 desktop computers is: $4250 + 6750 = 11000$

2. Total cost for $n$ notebooks and $d$ desktop computers:

For $n$ notebooks, the total cost is: $n \times 250$

For $d$ desktop computers, the total cost is: $d \times 375$

So, the total cost for $n$ notebooks and $d$ desktop computers is: $n \times 250 + d \times 375$

Summary:

• Total cost for 17 notebooks and 18 desktops: $11,000.
• Formula for total cost for $n$ notebooks and $d$ desktops: $250n + 375d$.

Do you need more details or have any questions?

Here are some related questions:

1. How would the total cost change if the number of desktops increased to 20?
2. What would be the total cost for 10 notebooks and 12 desktop computers?
3. If the school has a budget of $15,000, how many notebooks and desktops can they buy?
4. How does the cost function change if the price of notebooks or desktops increases?
5. Can you express the total cost in terms of percentages of the overall budget?

Tip: Always calculate the cost per unit first, then multiply by the number of units for accuracy.