jessiebotello7209
01.09.2019 •
Mathematics
The value of the 8th term is 78 the sequence is increasing by 10 each time. find the 20th term
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Ответ:
a8 = a + (8 - 1) x 10 = a + 7 x 10 = a + 70
a + 70 = 78
a = 78 - 70 = 8
20th term (a20) = 8 + (20 - 1) x 10 = 8 + 19 x 10 = 8 + 190 = 198
Ответ: