Since 2009 the number of smartphones shipped from manufacturers to stores around the world has increased exponentially. The growth

from 2009 through 2015 can be modeled using the function () =

174 • 1.67 where t is the number of years since 2009 and () is

measured in millions of smartphones.

Explain a way you could calculate exactly when smartphone manufacturers were shipping 500

million smartphones to stores around the world.

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:

it is 10.6 according to my calculations