D 2. Which is a step in proof by mathematical induction? O Substitute n = k + 2 into the formula.
Prove the formula is true for n = k.
O Assume the formula is true for some other value.
O Assume that the formula is true for the (k + 1) term.

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:

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.

answer:   y=2x-3

step-by-step explanation: