Answer:
900000
Explanation:
3*10^5+2*10^5+4*10^5
we can start by adding the base numbers (3, 2 & 4) since they are all being multiplied by 10^5: 3+2+4=9
so then we have 9*10^5
then we solve for 10^5, which is 10*10*10*10*10 or 100000
so we then have 9*100000 and we get
900000