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velikii [3]
3 years ago
5

In a chemistry course, a student scored 99 on one test, 98 on another test, and 88 on each of the other tests. the student’s tes

t average for the course, where each test is weighted equally, is exactly 91. what is the total number of tests that the student has taken in the course?
Mathematics
1 answer:
Alexxandr [17]3 years ago
8 0
The student took 7 tests. 

99+98+88+88+88+88+88 = 637


637/7 = 91
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Answer: choice A) 7017

==========================================================

Work Shown:

The first term is a_1 = 24 and we go up by 7 each time.
The common difference is d = 7

The nth term formula we'll use is
a_n = a_1 + (n-1)*d
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