Mailing a letter costs 37¢ for the

First ounce and 23¢ for each additional ounce.
Suppose that we want to write a cost function to describe this situation. Which of
the following is an independent variable?

A. the letter's weight B. the mailing cost
C. 37¢ D. the number of stamps needed

true statements:

a) x + y = y + x   ⇒ commutative property of addition

b) (x * y) * z = x * (y * z) ⇒ associative property of multiplication

d) (x + y) + z = x + (y + z) ⇒ associative property of addition

false statements:

c) x - y = y - x   should be: x - y = - y + x

e) (x - y) - z = x - (y - z) should be: (x - y) - z = x - (y + z)

step-by-step explanation:

this is answer of 144 cubic meters