Problem 1 :
Evaluate :
5  11
Problem 2 :
Evaluate :
9  (5)
Problem 3 :
Evaluate :
 3  (7)
Problem 4 :
Evaluate the following expression when x = 8.
x  (38)
Problem 5 :
Evaluate the following expression when x = 7.
6  x
Problem 6 :
Mr. John had $2225 account balance in a deposit in 2015 and $3725 in 2020. Find the change in his account balance from 2015 to 2020.
Problem 1 :
Evaluate :
5  11
Solution :
= 5  11
To subtract 11, add its opposite, 11.
= 5 + (11)
Add 5 and 11.
= 6
Problem 2 :
Evaluate :
9  (5)
Solution :
= 9  (5)
To subtract 5, add its opposite, 5.
= 9 + 5
Add 9 and 5.
= 11
Problem 3 :
Evaluate :
 3  (7)
Solution :
= 3  (7)
To subtract 7, add its opposite, 7.
=  3 + 7
Add 3 and 7.
= 4
Problem 4 :
Evaluate the following expression when x = 8.
x  (38)
Solution :
= x  (38)
Substitute 8 for x.
=  8  (38)
To subtract 38, add its opposite, 38.
= 8 + 38
Add 8 and 38.
= 30
Problem 5 :
Evaluate the following expression when x = 7.
6  x
Solution :
= 6  x
Substitute 7 for x.
= 6  (7)
To subtract 7, add its opposite, 7.
= 6 + 7
Add 6 and 7.
= 13
Problem 6 :
Mr. John had $2225 account balance in a deposit in 2015 and $3725 in 2020. Find the change in his account balance from 2015 to 2020.
Solution :
Change in account balance
=
Account balance in 2020

Account balance in 2015
Substitute values.
Change in account balance :
= 3725  2225
To subtract 2225, add its opposite, 2225
= 3725 + (2225)
= 1500
The change in John's account balance from 2015 to 2020 is $1500.
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