Question

Elena has $225 in her bank account. She takes out $20 each week for`\ w` weeks. After `w` weeks she has `d` dollars left in her bank account. Joe wrote the following incorrect equation to model the situation: `d=225\ -20`. What is wrong with Joe's equation? What can you tell Joe to help him correct his equation?

Answer 1

Joe's equation d = 225 - 20 is incorrect because it does not account for the number of weeks. To correct the equation, Joe should include 20w to represent the total amount of money taken out over w weeks.

Step-by-step explanation:

Joe's equation d = 225 - 20 is incorrect because it does not properly account for the number of weeks, represented by w. The equation should take into consideration that $20 is being subtracted for each week, for a total of 20w dollars being taken out.

To correct the equation, Joe can use the following: d = 225 - 20w. This equation demonstrates that the amount of money left in Elena's bank account, represented by d, is equal to the original amount, $225, minus $20 per week for w weeks.