which property is demonstrated? (12×7)×5=12×(7×5)

a. commutative property of addition
b. associative property of multiplication
c. associative property of addition
d. commutative property of multiplication

B. Associative Property of Multiplication

Step-by-step explanation:

The associative property states that you can add or multiply regardless of how the numbers are grouped. By 'grouped' we mean 'how you use parenthesis'. In other words, if you are adding or multiplying it does not matter where you put the parenthesis.

2^y = ln 5, or   y(ln 2) = ln 5.   solving for y,   y = (ln 5) / (ln 2).   y=5

step-by-step explanation:

true? is that what you're asking or do you mean something else?