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Ganezh [65]
3 years ago
9

Help with this one too?

Mathematics
1 answer:
KatRina [158]3 years ago
4 0

Answer:

a68 = -85.2

Step-by-step explanation:

The formula for an arithmetic sequence is

an = a1+d(n-1)

a1 =8.6   (it is the first term)

We can find the common difference by taking the second term and subtracting the first term

7.2-8.6 =-1.4

d=-1.4

n = the term number we are looking for

an = 8.6  -1.4(n-1)

We are looking for the 68th term so n=68

a68 = 8.6 -1.4(68-1)

      = 8.6 -.1.4(67)

      = 8.6-93.8

      =-85.2



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