Question

fill in the blanks below.
(a) chau withdrew 140 dollars from his checking account.
write a signed number to represent this change in his account.

(b) dans test score average increased by 12 points this semester.
write a signed number to represent this change in average.

Explanation:

Step1: Analyze part (a)

Withdrawal means a decrease in the account balance. In signed numbers, a decrease is represented by a negative number. So, withdrawing 140 dollars is -140.

Step2: Analyze part (b)

An increase in test score average means a positive change. So, an increase of 12 points is +12 (or just 12).

Answer:

(a) -140
(b) 12