Pls help me:) I rlly need it!

Answer
600,000

explanation
8•10^5 is 800,000 and
2•10^5 is 200,000
so subtract and you get 600,000

hope this helps and have a wonderful day :)

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post