Respuesta :

Answer:

I'm not sure about 20 but here's 21.

Part A is 274.622.

Part B is 282.018

Step-by-step explanation:

Part A show work:

278.320

-     3.698

________

 274.622

Part B show work:

278.320

+    3.698

________

 282.018

20. Seens to 1. 21. A. 21. B
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