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k = -3.8

Step-by-step explanation:

Equation Solving

We are given the equation:

k + 7.2 = 3.4

To solve the equation we must make k the subject, that is, isolate the letter k at the left side of the equation.

Since the number 7.2 is adding with k, we subtract 7.2 on both sides:

k + 7.2 - 7.2 = 3.4 - 7.2

Simplifying the left side, the numbers cancel:

k = 3.4 - 7.2

Now calculate the subtraction 3.4-7.2=-3.8

k = -3.8

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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