Identify the property being demonstrated for each expression. 3 + (5 + 7) = (3 + 5) + 7 (3)[5(7)] = (3)[7(5)] 5 + 0 = 5

3 + (5 + 7) = (3 + 5) + 7: Associative property of the addition

(3)[5(7)] = (3)[7(5)]: Associative property of the multiplication.

5 + 0 = 5: Neutral element addition

Step-by-step explanation:

3 + (5 + 7) = (3 + 5) + 7

This is the associative proprerty of the addition. That is, no matter the order we sum the values, the result is the same.

(3)[5(7)] = (3)[7(5)]

Association property of the multiplication. This is the associative proprerty of the addition. That is, no matter the order we multiply the values, the result is the same.

5 + 0 = 5

This is the neutral element of the addition, that is, any number added to 0 is itself.

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .