Answer:
2. 1.22*10^4
3. 1.2732*10^9
Step-by-step explanation:
2. 7000 = 7*10^3
5.2*10^3 + 7*10^3 = 12.2*10^3 = 1.22*10^8
3. China = 1.4*10^9 =14*10^8
Japan = 1.268*10^8
Difference = 14*10^8 - 1.268*10^8
= 12.732*10^8 = 1.2732*10^9
BTW * means multiplication sign and ^ means to the power
