Sometimes, an object may burn more rapidly in a fire compartment than it would in the open. This difference results from the radiant energy feedback from the hot smoke layer and the ceiling to the object. In house-size compartments, this effect is observed at what heat release rate

The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)