Question

fill in the blanks below.
(a) abdul deposited 40 dollars into his savings account.
write a signed number to represent this change in his account.

(b) the temperature fell by 2 degrees fahrenheit today.
write a signed number to represent this temperature change.

Explanation:

Part (a)

Step1: Determine the sign for deposit

A deposit means an increase in the account balance. In signed numbers, an increase is represented by a positive number.

Step2: Represent the deposit amount

Abdul deposited 40 dollars, so the signed number representing this change is \( + 40\) (or simply 40, as the positive sign is often implied but can be written explicitly).

Part (b)

Step1: Determine the sign for temperature fall

A fall in temperature means a decrease. In signed numbers, a decrease is represented by a negative number.

Step2: Represent the temperature change

The temperature fell by 2 degrees Fahrenheit, so the signed number representing this change is \( - 2\).

Answer:

(a) \( 40 \) (or \( +40 \))
(b) \( -2 \)