The normal mean temperature in borrow Alaska is -2F in November the normal mean temperature in October is 19F warmer than in November. What is the normal mean temperature in Octobe?

   17F

Step-by-step explanation:

(-2F) +(19F) = 17F

The signed numbers add in the usual way. (If you really can't do this in your head, a calculator can help.)

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step-by-step explanation:

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step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2