B ) 18x - 54ax + 38xz C) -3a - 2b + 14c - 2a + 4b + 14c
D) 8a - 2b - 2c + ( -15a) - 6b - 7c
The one who answers all these questions correctly and properly gets brainliest and 5 stars

the expected value of the random variable : 0, 1 and 2

step-by-step explanation:

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: