Math Smart 12 trig application question

math11

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I need a bit of help as I am doing Test 5 Trignometric Equations of my Complete Math Smart 12.

The average weekly temperature of Toronto can be modelled by T(w) = -24cos (2pi/52 w) + 8 in degree Celsius, where w is the number of weeks into a year. At which weeks in the year is the average temperature 20 degrees celsius?

The question I would like help with, its number 14, but if someone could post the entire answer key that would be great ;)
 
I need a bit of help as I am doing Test 5 Trignometric Equations of my Complete Math Smart 12.

The average weekly temperature of Toronto can be modelled by T(w) = -24cos (2pi/52 w) + 8 in degree Celsius, where w is the number of weeks into a year. At which weeks in the year is the average temperature 20 degrees celsius?

The question I would like help with, its number 14, but if someone could post the entire answer key that would be great ;)
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