Try to use photo math it gives you the work and answer
Answer:
B
Step-by-step explanation:
3.2 * 10⁷ + 6.4 * 10⁷
= 10⁷ * (3.2 + 6.4)
= 10⁷ * 9.6
= 9.6 * 10⁷
I think that the value of n is -10
Step-by-step explanation:
I am not sure. sorry if it is wrong