Perform the indicated operations involving rational expressions. Simplify answers completely.  For your answer, just enter the numerator (the top) of the simplified quotient.   

The DC Snipers and the Hillside Stranglers were both pairs of serial killers, but their relationships and motivations were quite different. Based on your understanding of these two teams, which statement best analyzes how their partnership influenced the way they committed their crimes?

H. H. Holmes was known not only for his murders but also for his charismatic and manipulative personality. Considering Holmes’s ability to deceive victims and evade suspicion, which of the following best analyzes how his personality traits contributed to his criminal success and eventual downfall?

The figure on the right shows the DNS resolving process when a host in nyu.edu wants to visit a host in umass.edu. Which DNS servers belong to the DNS hierarchical structure? What are the content in the  5th and 8th messages?   

Which of the following is true regarding the somatic motor system and the autonomic nervous system?

Which region of the hindbrain functions to control movements that are smooth and goal-directed (movements that require dexterity) like touching your finger to your nose?

During saltatory conduction in a myelinated axon, where do action potentials regenerate as the signal is conducted down the axon?

Ca2+ allows vesicles in axon terminals to eject their neurotransmitters into the synaptic cleft by exocytosis; how does Ca2+ get into the axon to carry out this function?

When you eat something sour, how are the specific taste cells activated, ultimately resulting in you tasting something sour?

All of the following are signs of an airway obstruction except?