Identify the property shown: 5 + (7+8) = (5+7) + 8

Associativity

Step-by-step explanation:

Associativity defines that grouping elements within in a group in different successive fashion doesn't make them loose their meaning.

Example

(A×B)× C= A×(B×C)

oder of operations

Step-by-step explanation:

factor it out

Step-by-step explanation:

Side 1 = a

Side 2 = b

Side 3 = c

a = 2b

c = 5ft. + b

a + b + c = 49 feet

Substitute

2b + b + 5ft + b = 49 ft

Add the b’s

4b + 5ft = 49ft

Subtract 5ft from both sides of the equation

4b = 44ft

Divide both sides of the equation by 4 to isolate b

b = 11ft

a = b * 2 = 11 * 2 = 22ft

c = 49ft - 11ft - 22ft = 16ft

Hope this helps :)