Answers

2015-06-16T20:59:19+08:00
FORMULA: an=a1+(n-1)d

example: 
Insert 4 arithmetic means between 5 and 25.Find the 4 terms between them.

SOLUTION:   
an=a1+(n-1)d                    ANSWER: 9,13,17,21
a=5+5d                                                     
25=5+5d
25-5=5d
5d
= 20
5      5
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