Which statement shows the associative property of addition?

a.
if m + 3 = 18, then 18 = m + 3

b.
(u + 7) + 13 = u + (7 + 13)

c.
21 + 2y = 2y + 21

d.
3 · (5 · x) = (3 · 5) · x

Question 10 of 211 pointuse the elimination method to solve the system of equations. choose thecorrect ordered pair.10x +2y = 643x - 4y = -36a. (4,12)b. (-3, 11)c. (2,10)d. (-5, 8)

In september, louise planted a tree. every month, the tree louise planted grew 2 inches. what would the constant of proportionality of the line be?

Consider the enlargement of the pentagon. what is the value of x, rounded to the nearest tenth? 2.1 centimeters 3.3 centimeters 7.0 centimeters 15.0 centimeters