In order to subtract fractions, you need the denominators (bottom number) to be the same.

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Answer:
The more time spent reading
Step-by-step explanation:
The 2 that had 4 hours of read time had an A
Answer:
*1 month later*
Step-by-step explanation:
Answer:
not enough info, make another question with the problem attached
Step-by-step explanation:
21,800,000 rounded to the nearest million = 22,000,000