Answer:
40 cm^2
Step-by-step explanation:
A difference is the result of a subtraction.
Call the number n.
"seven times a number": 7n
"eight more than four times the number": 4n + 8
"The difference between seven times a number and eight more than four times the number": 7n - (4n + 8)
Answer: 7n - (4n + 8)
To the total amount of money that a dealer spent is $7 + $9 or %16. His revenue from selling the same articles is $8 + $10 which is equal to $18. The profit is the difference between the total revenue and total cost.
profit = $18 - $16 = $2
Thus, the dealer has a profit of $2.