At the start of 2010, an online social group had 360 million members. Subsequently, new members joined at a rate of roughly m(t) = −9.9t2 + 14t + 260 million members per year    (0 ≤ t ≤ 5), where t is time in years since the start of 2010. (a) Find an expression for the total online social group membership  M(t) at time t.  m(t)=_______________________________________   (b) Use the answer to part (a) to estimate the online social group membership midway through 2012. (Round your answer to the nearest 1 million members.) M(2.5) = __________________________million members

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.7: Applications
Problem 13EQ
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At the start of 2010, an online social group had 360 million members. Subsequently, new members joined at a rate of roughly

m(t) = −9.9t2 + 14t + 260 million members per year    (0 ≤ t ≤ 5),

where t is time in years since the start of 2010.

(a) Find an expression for the total online social group membership 
M(t) at time t
m(t)=_______________________________________
 
(b) Use the answer to part (a) to estimate the online social group membership midway through 2012. (Round your answer to the nearest 1 million members.)
M(2.5) = __________________________million members
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