SOLUTION: solve 100=-60cos(pi/30(t))+70

Question 1161394: solve 100=-60cos(pi/30(t))+70
Answer by Edwin McCravy(20065) (Show Source): You can put this solution on YOUR website!



Subtract 70 from both sides







The cosine is negative in QII and QIII.



Multiply through by 

           





Cancel all the πs






Those are the two answers

Edwin

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