Page 175 - IM_Algebra2_FL Print Sample.pdf
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10.4 Half the Homework
Cool Down: 5 minutes
Student Task Statement
Lin spent 80 minutes doing homework on Monday. Each day from Tuesday through Friday, Lin spent half as much time doing homework as the day before.
How much total time did Lin spend doing homework, from Monday through Friday?
Student Response
Lin spent 155 minutes, because .
Student Lesson Summary
The sum of a sequence is the sum of its terms.
For example, suppose you were given $1 on the rst day, then $2 the second day, then $4 the third day, and it doubled each day for seven days. After nding each term of the sequence, you can nd the sum:
For these seven days, the total amount of money is $127. In a later unit, you will learn a method to nd the sum of a geometric sequence more e ciently.
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Teacher Guide Algebra
