Tammy is participating in a 5 -day cross-country biking challenge. she biked for 63 , 50 , 63 , and 60 miles on the first four days. how many miles does she need to bike on the last day so that her average (mean) is 60 miles per day?

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: