The two most commonly used systems of coordinates are the rectangular (or cartesian) and the
a. horizontal.
b. quadrant.
c. euclidean.
d. polar.

D. Polar.

Step-by-step explanation:

We are asked to choose the two most commonly used systems of coordinates.

We know that most commonly used systems of coordinates are the rectangular coordinate system and the polar coordinate system.

The rectangular coordinate system is also known as Cartesian coordinate system.

Therefore, option D is the correct choice.

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: