A plane descends from a higher altitude to a lower altitude at a rate of 100 feet per second. Which equation models the change in altitude after 15 seconds? A. (15)(100) = 1500 feet
B. (15)(-100) = -1500 feet
C. (-15)(-100) = 1500 feet
D. (-15)(100) = -115 feet

a-(15)(100)=1500 feet

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