omar2334
24.11.2020 •
Mathematics
In an arithmetic sequence, the 7th term is 30, and the 11th term is 60. What is the 21st term of this sequence?
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Ответ:
135
Step-by-step explanation:
7th term ;a + 6d = 30
11th term; a + 10d = 60
solving simultaneously,a= -15 ,d= 7.5
21st term = a + 20d= 135
Ответ: