Find the 84th term of the arithmetic sequence −27,−12,3

2 answers:

6 0

Aritmetic has a common difference
-27 to -12 is a difference of 15
-12 to 3 is a difference of 15

an=a1+d(n-1)
a1=first term
d=common difference

fist term is -27
common difference is 15

an=-27+15(n-1)
84th term is n=84
a84=-27+15(84-1)
a84=-27+15(83)
a84=-27+1245
a84=1218

the 84th term is 1218

arsen [322]3 years ago

4 0

The answer will be 1218.

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jenyasd209 [6]

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Step-by-step explanation:

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You can double-check using the sine ratio:

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Insert the equation into a calculator:

$x=11$

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*It's important to know that, when working with trigonometry ratios, the hypotenuse is never considered the adjacent or opposite side, and the 90° angle is never used in the ratios.

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