Matched Problem 6 There are currently 64,000 subscribers to an online fashion magazine. Due to competition from an 8-month-old competing magazine, the number C ( t ) of subscribers is expected to decrease at the rate of C ′ ( t ) = − 600 t 1 / 3 subscribers per month, where t is the time in months since the competing magazine began publication. How long will it take until the number of subscribers to the online fashion magazine drops to 46,000?
Matched Problem 6 There are currently 64,000 subscribers to an online fashion magazine. Due to competition from an 8-month-old competing magazine, the number C ( t ) of subscribers is expected to decrease at the rate of C ′ ( t ) = − 600 t 1 / 3 subscribers per month, where t is the time in months since the competing magazine began publication. How long will it take until the number of subscribers to the online fashion magazine drops to 46,000?
Solution Summary: The author explains the time taken for the number of subscribers to the online fashion magazine to become 46,000 is 12 months.
Matched Problem 6 There are currently 64,000 subscribers to an online fashion magazine. Due to competition from an 8-month-old competing magazine, the number C(t) of subscribers is expected to decrease at the rate of
C
′
(
t
)
=
−
600
t
1
/
3
subscribers per month, where t is the time in months since the competing magazine began publication. How long will it take until the number of subscribers to the online fashion magazine drops to 46,000?
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ANALYZING RELATIONSHIPS Describe the x-values for which (a) f is increasing or decreasing, (b) f(x) > 0 and (c) f(x) <0.
y Af
-2
1
2 4x
a. The function is increasing when
and
decreasing when
By forming the augmented matrix corresponding to this system of equations and usingGaussian elimination, find the values of t and u that imply the system:(i) is inconsistent.(ii) has infinitely many solutions.(iii) has a unique solutiona=2 b=1
3/4+1/2=
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