The surface of an office desk has an area of 18 square feet. Its perimeter is 18 feet. What are the dimensions of the desk?

the dimensions are 3 and 6 feet

Step-by-step explanation:

xy=18

x+y=9

x=9-y

y(9-y)=18

-y^2+9y -18=0

y^2-9y+18=0

(y-6)(y-3)=0

if y=6, x=3

if y=3, x=6

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: