The time, T (seconds) it takes for a pot of water to boil is inversely proportional to the cooker setting, H , applied to the pot. When H = 3 , T = 140 . What must the cooker setting be if it takes 7 minutes to boil the water?

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

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if you was gonna solve for a, a is a   < -12

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im not sure what the answer is