Question

the table shows eight expressions.
determine the value of each expression.

expression number

expression

value

----

----

----

1

$1+2-3$

2

$1+2-3+4$

3

$1+2-3+4-5$

4

$1+2-3+4-5+6$

5

$1+2-3+4-5+6-7$

6

$1+2-3+4-5+6-7+8$

7

$1+2-3+4-5+6-7+8-9$

8

$1+2-3+4-5+6-7+8-9+10$

Explanation:

Step1: Calculate Expression 1

$1+2-3 = 3-3 = 0$

Step2: Calculate Expression 2

$1+2-3+4 = 0+4 = 4$

Step3: Calculate Expression 3

$1+2-3+4-5 = 4-5 = -1$

Step4: Calculate Expression 4

$1+2-3+4-5+6 = -1+6 = 5$

Step5: Calculate Expression 5

$1+2-3+4-5+6-7 = 5-7 = -2$

Step6: Calculate Expression 6

$1+2-3+4-5+6-7+8 = -2+8 = 6$

Step7: Calculate Expression 7

$1+2-3+4-5+6-7+8-9 = 6-9 = -3$

Step8: Calculate Expression 8

$1+2-3+4-5+6-7+8-9+10 = -3+10 = 7$

Answer:

Expression Number	Value
2	4
3	-1
4	5
5	-2
6	6
7	-3
8	7