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15-09-2020
Mathematics

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Find the 1st term of a sequence if the common difference = -2 and the 13th term =59

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mhanifa mhanifa

16-09-2020

Answer:

83

Step-by-step explanation:

Formula for 13th term:

t(13) = a + 12d, where a- first term, d- common difference

Given

t(13) = 59
d = -2
a = ?

As per the formula for 13th term:

59 = a + 12*(-2)
59 = a - 24
a = 59 + 24
a = 83

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