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ivanzud
 one year ago
Urgent:Action Required:::
The temperature of a chemical reaction ranges between 40 degrees Celsius and 180 degrees Celsius. The temperature is at its lowest point when t = 0, and the reaction completes 1 cycle during a 12hour period. What is a cosine function that models this reaction?
ivanzud
 one year ago
Urgent:Action Required::: The temperature of a chemical reaction ranges between 40 degrees Celsius and 180 degrees Celsius. The temperature is at its lowest point when t = 0, and the reaction completes 1 cycle during a 12hour period. What is a cosine function that models this reaction?

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ivanzud
 one year ago
Best ResponseYou've already chosen the best response.0is it f(t) = 70 cos 12t + 110?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the amplitude A of your function is: \[\Large A = \frac{{180  40}}{2} = ...?\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0since the period of our function is 12 hours, so the shape og our function has to be this: \[\Large \cos \left( {\frac{{2\pi }}{{12}}t} \right)\]

ivanzud
 one year ago
Best ResponseYou've already chosen the best response.0but why 70 in the front?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0since at t=0, the value is 40, then we have this drawing: dw:1436896425801:dw now, if I set t=0 into the first option I get: f(0)= 180 so the first option is not the right option

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0please substitute t=0 into the third option, what do you get? f(0)=...? 70 cos + 110? we have: \[\Large  70\left( {\cos 0} \right) + 110 =  70 \times 1 + 110 = 40\] So da answer is C. U WELCOME IF ANY OF YALL NEED HELP IN MATH JUST ASK ME IM A LITTLE GOOD IN MATH k PEACE OUT SON
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