3+(4+5) = ( 3+4 ) +5.THIS IS AN EXAMPLE OF THE OF WHOLE NUMBERS.
(a) COMMUTATIVE PROPERTY OF ADDITION.
(b) COMMUTATIVE PROPERTY OF MULTIPLICATION.
(c) ASSOCIATIVE PROPERTY OF MULTIPLICATION
(d) ASSOCIATIVE PROPERTY OF ADDITION.

D.

Step-by-step explanation:

The problem is clearly addition, so we can rule out B and C. Associative property is the movement of the parentheses, whereas commutative property is the movement or reorganization of the numbers. The parentheses moved in this problem, so it is associative. I suggest reviewing these properites, they come in handy later and are good to know :)

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x