A higher frequency. I just got this answer on usa test prep.
Answer:
<u>Distance</u><u> </u><u>between</u><u> </u><u>them</u><u> </u><u>is</u><u> </u><u>4</u><u>,</u><u>2</u><u>0</u><u>0</u><u> </u><u>meters</u><u>.</u>
Explanation:
Consinder car A:

substitute:

Consider car B:

since these cars move in opposite directions, distance between them is their summation:

Answer:
Sorry
Explanation:
I really don't know what to say about this question I am not sure what to say about this
He invented the first microscope, and was the first person to really see multi-cellular organisms. His contribution to the scientific world was huge.
That's all I got, sorry