Question

Stella rewrites -2 1/2 plus 3.7 using commutative Property of addition. Which expression did she write?

Answer 1

Answer:
`3.7-2.5`

Explanations:

The rule for the commutative property of addition is:

a + b = b + a

Stella writes:

`-2(1)/(2)\text{ plus 3.7}`

This can be expressed mathematically as:

`-2(1)/(2)+3.7`

Which according to the property of commutativity can also be written as:

`\begin{gathered} 3.7\text{ + (-2}(1)/(2)) \\ 3.7\text{ - 2}(1)/(2) \end{gathered}`

The expression Stella wrote based on the commutative property of addition is therefore:

`\begin{gathered} -2(1)/(2)+\text{ 3.7 or} \\ 3.7\text{ - 2.5 (Note that 2}(1)/(2)=2.5) \end{gathered}`