10. Howard slept from $$ 9: 00 $$ pm until 6:00 A.M. the next morning. How many minutes did he sleep?

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1. First, convert the sleeping time into hours. Howard slept from $$ 9:00 $$ pm to midnight and then from midnight to $$ 6:00 $$ am.
2. The time from $$ 9:00 $$ pm to midnight is:
   $$
   12:00 \text{ am} - 9:00 \text{ pm} = 3 \text{ hours}
   $$
3. The time from midnight to $$ 6:00 $$ am is:
   $$
   6 \text{ hours}
   $$
4. Thus, the total hours slept is:
   $$
   3 \text{ hours} + 6 \text{ hours} = 9 \text{ hours}
   $$
5. To convert hours to minutes, multiply by $$ 60 $$:
   $$
   9 \times 60 = 540 \text{ minutes}
   $$

Therefore, Howard slept for $$ 540 $$ minutes.
Howard slept for 540 minutes.

10. Howard slept from \( 9: 00 \) pm until 6:00 A.M. the next morning. How many minutes did he sleep?

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