Answer:
I believe that the answer is 14.
Step-by-step explanation:
hope it helped
 
        
             
        
        
        
To my knowledge (im not the smartest person lol) I would say no he cannot
        
                    
             
        
        
        
Answer:
(2l + 2w) + (a + b + c)
Step-by-step explanation:
The formula for the perimeter of a rectangle is 
P = 2l + 2w
so if you substitute, it becomes
P = 2(12) + 2(2)
= 24 + 4
= 28
For the perimeter of a triangle the correct formula would be 
P = a + b + c
The missing side in the triangle is 3 because 15 - 12 is 3. 
If you substitute, it becomes
P = 2 + 3 + 6
P = 11
If we add both perimeters together we get the full perimeter of the figure which is 
28 + 11 = 39
I am not sure if you wanted the answer as well but just in case :)
 
        
             
        
        
        
For the sum we have the following properties:
 The properties are commutative, asosiative, distributive and neutral element.
 Commutative property: When two numbers are added, the result is the same regardless of the order of the addends.
 Associative property: When three or more numbers are added, the result is the same regardless of the order in which the addends are added.
 Neutral element: The sum of any number and zero is equal to the original number.
 Distributive property: The sum of two numbers multiplied by a third number is equal to the sum of each summand multiplied by the third number.<span><span>
 </span><span>For subtraction we have:
 
</span><span> The arithmetic operation of the subtraction (subtraction) is indicated by the minus sign (-) and is the opposite, or inverse, operation of the addition. </span><span>That is, it is an arithmetic operation that serves to find the difference between two numbers.
</span><span> 
 In subtraction A - B = D
 </span><span>A is the minuendo
 </span><span>B is the substraendo
 </span><span>D is the difference
 </span><span>Answer:
 </span><span>The properties of addition and subtraction serve to rewrite and simplify calculations.</span></span>