andilephethile70 andilephethile70

28-04-2021
Mathematics

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the fifth term of an arithmetic sequence is 23 and the 12th is 72. determine the next three terms and general formula

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Ariannabanks10 Ariannabanks10

28-04-2021

Answer:

first three terms are -5 , 2, and 9

Step-by-step explanation:

term(n) = a + (n-1)d

term5 = a+ 4d = 23

term12 = a + 11d = 72

subtract them

7d = 49

d = 7

sub into a+4d = 23

a + 28 = 23

a = -5

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