ANSWER:

STEP-BY-STEP EXPLANATION:
We have the following expression:

In order to operate, we must first break the parentheses and then group similar terms, like this:
Answer:
The average acceleration of train is 
Step-by-step explanation:
We have,
A train that slows down from 15 m/s to 8.6 m/s in 1.2 s. It means that 15 m/s is its initial velocity and 8.6 m/s is its final velocity.
It is required to find the average acceleration of the train.

The average acceleration of train is
. Negative signs shows that the train is decelerating.
Answer:
3 1/5 (or 3.5)
Step-by-step explanation:
2(7) - 7(-1)
_______
7 + -1
Next:
14 + 7 (two negatives make a positive)
_____
6
Next:
21/6 which equals 3 1/2 (3.5)
Answer: 12x+27
Step-by-step explanation: 3*4=12 and 3*8=24 24+3=27 so simplyfy it and you would get 12x+27
Answer:
look close because that is the question
Step-by-step explanation: