<h3>
Answer:</h3>
Your answer would be 4000.
The only step needed:
Multiply 400 by 10.
400 ---> 400×10 ---> 4000
Hope this helps, :)
Step-by-step explanation:

I hope this helps you
2d^2 -2d-7
(14d^2 - 8) + (6d^2 - 2d + 1)
14d^2 - 8+ 6d^2 - 2d + 1
20d^2 - 7 - 2d
20d^2 - 2d - 7