Answer:
The total cost of 15 notebooks, and 16 desktop computers is $7425
The total cost of n notebooks, and d desktop computers is 175n + 300d
Explanations
Given the following parameters
Cost of a notebook computer = $175
Cost of a desktop computer = $300
The cost of 15 notebooks and 16 desktop computers = 15(175) + 16(300)
The cost 15 notebooks and 16 desktop computers = 2,625 + 4800
The cost 15 notebooks and 16 desktop computers $7425
Hence the total cost of 15 notebooks, and 16 desktop computers is $7425
The cost of n notebooks = 175n
The cost of d desktop = 300d
Hence the total cost of n notebooks, and d desktop computers is 175n + 300d