13. The Chapter 8 eManipulative activity Chips Minus on our Web site demonstrates how to use black and red chips to model integer subtraction. After doing a few examples on the eManipulative, sketch how the chip model could be used to do the following problems. a.3-7 b. 4- (-5) 18. Dixie had a balance of $1 15 in her checking account at the beginning of the month. She deposited $384 in the account and then wrote checks for $153, $86, $196, $34, and $79. Then she made a deposit of $123. If at any time during the month the account is overdrawn, a $10 service charge is deducted. At the end of the month, what was Dixie's balance?6. Show how you could find the following sums (i) using a number-line model and (ii) using black and red chips. Look at the Chapter 8 eManipulative activity Chips Plus on our Web site to gain a better understanding of how to use the black and red chips. a. 5+ (-3) b. (-3) + (-2)