Add or subtract as indicated:
A5.80×10^9s + 3.20×10^8s
B4.87×10^-6m - 1.93×10^-6m
C3.14×10^-5kg + 9.36×10^-5kg
D8.12×10^7g - 6.20×10^6g
How do I solve these?
A5.80×10^9s + 3.20×10^8s
B4.87×10^-6m - 1.93×10^-6m
C3.14×10^-5kg + 9.36×10^-5kg
D8.12×10^7g - 6.20×10^6g