Question

The last
5
transactions from Carson's checking account were
−
$
20
,
−
$
10
,
$
30
,
$
10
,
−
$
40
. Carson writes the sum of transactions as
(
−
40
)
+
(
−
20
)
+
(
−
10
)
+
10
+
30
.



Which approach shows how find the sum of the transactions?



A.
(
−
60
)
+
(
−
10
)
+
10
+
30

=
(
−
60
)
+
0
+
30

=
$
30

B.
(
−
60
)
+
(
−
10
)
+
10
+
30

=
(
−
60
)
+
0
+
30

=
−
$
30

C.
(
−
40
)
+
(
−
20
)
+
20
+
30

=
(
−
40
)
+
40
+
30

=
0
+
30

=
$
30

D.
(
−
40
)
+
(
−
20
)
+
(
−
20
)
+
30

=
(
−
40
)
+
(
−
20
)
+
50

=
−
60
+
30

=
−
$
30

Answer 1

B

Explanation: (-40)+(-20)+(-10)+10+30 = (-60)+(-10)+10+30. The -10 and +10 cancel (0), so (-60)+0+30 = -60+30 = -30. So the sum is −$30.