What would X be if those are the numbers?

i beleive 2 2/3

Step-by-step explanation:

the change from 9 to 13.5 is 2/3

5/3 (the whole of 4 plus 2/3 of it) of 4 is 6 2/3

6 2/3=x+4

2 2/3=x

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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