Ineed urgent on number 4 ! : : fiona works n hours a month at a job earning x dollars pero hour. she also works p hours a month at a job earning y dollars an hour. each month , she earns an average of z dollars an hour . this formula can be used to represent this situation.

(nx + py) / (x + y) = z, solve for p

nx + py = z(x + y)

py = z(x + y) - nx

py = zx + yz + nx

p = (zx + yz + nx) / y

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:

i’m here for points.