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snapster replied to the topic Last weeks test question in the forum Algebra 3 months, 2 weeks ago
First thing you’d do is add them up.
But, if you use the formula for the sum of the terms of an arithmetic series:
S=(n/2)[2a+(n-1)d], where n is the numbers of terms (10), a is the first term (4) and d is the […] -
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