Determine the check digit (d) for the UPC number 4-53648-94211-d.
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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:

i'm guessing it could be 4 or 1 but i think it's 4

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          √25                                         √33               √36      

i made this little number line up there for a visual example. : d

to find √33, you take the nearest root vales you know right off the bat. √25 and √36 which is 5 and 6, correct? and on the number line, you can see that √33 falls closer to √36, 6. so we know that √33 is going to be 5 point. something, right? but because 33 is so close to six, it is going to be a higher number for 5 point. something. so it is approximately 5.7