Mia buys 4.2 pounds of plums. The total cost after using a coupon for 55 cents off her entire purchase was $3.23. If c represents the cost of the plums in dollars per pound, find an equation to represent the situation.

The correct answer is: 4.2c - 0.55 = 3.23

Here , we have to write the equation of the given problem.
Firstly,
Let be assume the cost of plum be c,
Mia buy 4.2 pound of plums so this is quantity which cost was not fixed so we can write as ,
4.2c ,
And , she got discount of 55 cent = $0.55 so it is fixed amount,
The total purchase cost was $3.23 ,
So we can write the equation about cost that is,
4.2c – 0.55 = 3.23 ,
We are using here minus sign because she got the discount of 55 cent so the price were decreased.
Therefore, the correct answer is 4.2c – 0.55 = 3.23.

In this question, we have to write the equation for the given situations. Here Mia got discount of 55 cent that’s why we use subtraction. If subtract, subtract from, difference , between, less, less than, exceeds , etc words are used then it is always subtraction.