Answer:
Associative property of addition
Step-by-step explanation:
The associative property of addition is as follows :
a+(b+c) = (a+b)+c
We have,
a = 8, b = 9 and c = 3
So,
Using above property,
(8+9)+3 = 8+(9+3)
20 = 20
Hence, this is the required solution.
B I only understood that one the others not so much, tell me if this doesn’t help
Answer:
of a second
Step-by-step explanation:
We can convert each time into fractions.
11.74 is the same thing as 
and 11.69 is the same thing as 
.
We know that 11 - 11 = 0, so we can focus on the fractions for now.
Let's subtract 
from 
.
.
We can now simplify 
by dividing both the numerator and denominator by 5.
.
Hope this helped!
The answer to your question is 0.56
