If you buy 3 books at $3.95 each, how much change will you get from $20? * show work*

so to do this i would make the equation:

3*3.95+x=20

11.85+x=20

x=8.15

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:

it is x=-4

step-by-step explanation: