As vp for operations at méndez-pinero engineering, you must decide which product design, a or b, has the higher reliability. b is designed with backup units for components upper r 3 and upper r 4. product design a upper r 1=0.97 upper r 2=0.92 upper r 3=0.997 upper r 4=0.991 right arrow product design b 0.97 0.92 0.981 0.97 right arrow | | 0.94 0.97 upper r 1 upper r 2 upper r 3 upper r 4 the overall reliability of the system provided in design a = nothing% (enter your response as a percentage rounded to two decimal places).

advanced placement tests

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.