Triangle ABC and DEF are similar what is the length of segment DF?
1 answer:
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ANSWER
EXPLANATION
The explicit rule for an arithmetic sequence is given by:
It was given that:
and
The common difference is
We plug in the values into the explicit formula to get,
Expand to get,
The explicit rule is
Answer:
40 terms
Step-by-step explanation:
the sum to n terms of an arithmetic sequence is
=
(a₁ +
)
then
(- 4 - 82) = - 1720 ( multiply both sides by 2 to clear the fraction )
- 86n = - 3440 ( divide both sides by - 86 )
n = 40
the series has 40 terms