What is the sum of the measures of the interior angles of a 12-gon?
a-1620°
b-1800°
c-1980°
d-2160

we know that

The formula to calculate the sum of the measure of the interior angles in a polygon is equal to

where

n is the number of sides of the polygon

in this problem we have

substitute in the formula

therefore

the answer is the option B

each side has a different length.  

step-by-step explanation:

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: