Here you go!! Hope my answer also assists you in the future!! :))
Assignment: 
<><><><><><><>
Answer: 
<><><><><><><>
Explanation: 
<><><><><><><>
[ Step One ] Remove Parenthesis (a) = a

[ Step Two ] Simplify Equations



[ Step Three ] Rewrite Equation

[ Step Four ] Add Similar Elements

[ Step Five ] Rewrite Equation

<><><><><><><>
Answer:
14
Step-by-step explanation:
we are solving 15 + |-3| - 4
anything inside | | means it's absolute value.
absolute value means that even if it is a negative number inside, it will change to positive. if it is a positive number inside, it will stay the same.
so |-3| is 3.
15 + 3 - 4
18 - 4 = 14.
we got the answer
The answer is .4x because -3.4x+3.8x