Answer :

MohamedSharif
#10)0.000000001=1 x 10^-9
#11)2 x 10^5=2x 10^6
       3 x 10^4=3 x 10^5
answer=2000000+300000=2,300,000
#12)1.2 x 10^5=1,200,000
       9 x 10^4=900,000
answer=2,100,000
#13)0.00003 x 40000000
answer=1200=1.2x10^3

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