3 < x + 4 <10

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Work Shown:

3 < x+4 < 10

3-4 < x+4-4 < 10-4 ... subtract 4 from all sides

-1 < x+0 < 6

-1 < x < 6

The variable x is between -1 and 6, excluding both endpoints.

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: