Write or draw to explain two ways you can find the sum of 3+4+5

Here, the given problem,

3+4+5,

By the associative property,

3+4+5 = 3 + (4 + 5) = (3+4) + 5

First way :

(3+4) + 5

In the number line,

Start from 3, go right side 4 unit resultant number is 7,

Then again go right side 5 units the resultant number is 12.

That is, (3+4) + 5 = 12

Second way :

3 + (4 + 5),

Start from 4, go right side 5 units, the resultant number is 9,

Then, start from 3 go right side 9 units, the resultant number is 12.

That is, 3 + (4 + 5) = 12

a. the are of the rectangle is 18.25

b. 18.25 times two is 36.50

rae me : d

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step-by-step explanation: