North Dakota Electric Company estimates its demand trend line (in millions of kilowatt hours) to be: D = 80.0 + 0.45Q,

where Q refers to the sequential quarter number and Q = 1 for winter of Year 1. In addition, the multiplicative seasonal factors are as follows:

Quarter Factor (Index)

Winter 0.72

Spring 1.25

Summer 1.40

Fall 0.63

In year 26 (quarters 101-104), the energy use for each of the quarters beginning with winter is (round your response to one decimal place):

90.3 ; 157.4 ; 176.9 ; 79.9

Explanation:

Given that:

Estimated demand trend line (in millions of kilowatt hour) for North Dakota Electricity company is :

D = 80.0 + 0.45Q,

Q = quarter number

Quarter Factor (Index)

Winter 0.72

Spring 1.25

Summer 1.40

Fall 0.63

In year 26 (quarters 101-104):

Energy use (E) for each quarter = (Demand * quarter factor)

Winter ; Q = 101

E = [80.0 + 0.45(101)] * 0.72 = 90.3

E = [80.0 + 0.45(102)] * 1.25 = 157.4

E = [80.0 + 0.45(103)] * 1.40 = 176.9

E = [80.0 + 0.45(104)] * 0.63 = 79.9

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.'

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