Two Step Equation Word Problem

h = the number of hours

72 - 0.6h = 68.4

[The temperature was 72°F and it drops/decreases 0.6°F per hour(h), and the current temperature = 68.4°F]

To find h, isolate/get the variable "h" by itself in the equation:

72 - 0.6h = 68.4        Subtract 72 on both sides

72 - 72 - 0.6h = 68.4 - 72

-0.6h = -3.6    Divide -0.6 on both sides to get "h" by itself

  (two negative signs cancel each other out and become positive)

h = 6      6 hours have passed

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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