A portable concrete test instrument used in construction for evaluating and profiling concrete surfaces (MACRS-GDS 5-year property class) is under consideration by a construction firm for $21,000. The instrument will be used for 6 years and be worth $1,000 at that time. The annual cost of use and maintenance will be $11,500. Alternatively, a more automated instrument (same property class) available from the manufacturer costs $30,000, with use and maintenance costs of only $7,000 and salvage value after 6 years of $4,500. The marginal tax rate is 25%, and MARR is an after-tax 12%. Required:
Determine which alternative is less costly, based upon comparison of after-tax annual worth.

answer; i believe both technician (a) and (b) are correct; /// good luck

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.'

answer///the stewardship worldview;