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Anna is going to play guitar in her school's annual concert. If she starts by practicing for one hour per day and increases the time by 30 minutes each day, how long will she practice on the seventh day?

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divergent1121
day 1: 1 hour
day 2: 1 hour 30 minutes
day 3: 2 hours
day 4: 2 hours and 30 minutes
day 5: 3 hours 
day 6: 3 hours 30 minutes
day 7: 4 hours
 
On the seventh day Anna will be playing for 4 hours. all you do is increase each day by 30 minutes as shown above.

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