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Naily [24]
3 years ago
15

Tell whether the sequence 12, 4, -4, -12, -20, ... is arithmetic

Mathematics
2 answers:
Shkiper50 [21]3 years ago
8 0

Answer:

yes, it is arithmetic as the common difference is -8

Mashcka [7]3 years ago
3 0

Good evening

Answer:

<h2>Yes it’s an arithmetic sequence </h2>

Step-by-step explanation:

→ 4-12=-8

→ -4-4=-8

→ -12-(-4)=-8

→ -20-(-12)=-8

<u><em>As you can see the difference between any two consecutive terms is the same which prove that it’s an arithmetic sequence</em></u> .

_______________________________________

:)

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<u>Solution:</u>

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\begin{array}{l}{\rightarrow a(19)=a+(19-1) 15} \\\\ {\rightarrow 135=a+18 \times 15} \\\\ {\rightarrow a=135-270} \\\\ {\rightarrow a=-135}\end{array}

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