I think that you have forgot to divide at the end, like the first one would be 28 because you would divide by an estimate of 2
Answer:
or 
Step-by-step explanation:
we have

step 1
Group terms that contain the same variable

step 2
Combine like terms

step 3
Eliminate parenthesis

step 4
Factor the number 

The answer is 0.948
Enjoy your day/night!
Step 2 they added instead of multiplied
Answer:
8,400
Step-by-step explanation:
