The monthly sales S (in thousands of units) of a seasonal product are modeled by the following equation, where t is the time (in months), with  t = 1 corresponding to January. S = 56.3 + 33.5 cos(πt/7) Determine the months when sales exceed 75,000 units.

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter3: Radian Measure
Section3.3: Definition Iii: Circular Functions
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The monthly sales S (in thousands of units) of a seasonal product are modeled by the following equation, where t is the time (in months), with 
t = 1 corresponding to January.
S = 56.3 + 33.5 cos(πt/7)

Determine the months when sales exceed 75,000 units. 

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