Problema Solution
The original price of a model car is d dollars. You use a coupon and buy the kit for (d-10) dollars. You assemble the model car and sell it for (2d-20) dollars. Write an expression that represents your earnings. Interpret the expression.
Answer provided by our tutors
Earnings = Sell Cost - Buy Cost
Earnings = 2d - 20 - (d - 10)
Earnings = 2d - 20 - d + 10
Earnings = d - 10
The expression d - 10 represents the earnings.