Checking one's postal mailbox is generally reinforced on a schedule, because the mail only comes once per day at about the same time. choose the correct answer from the following choices
a) fixed-ratio
b) variable-ratio
c) fixed-interval
d) variable-interval

"“forty or fifty years ago, many people thought that simply transferring technologies from industrialized to developing countries would close the technology gap. now we know that technologies developed in industrialized countries may not be suitable for use in other environments. they may require a particular type of infrastructure to operate. they may need specialized parts or knowledge to mend when they break we now understand that innovative capacity must be built in different ways." - united nations secretary-general ban ki-moon based on the secretary general's comments, which of these would be most important for a country to improve? a) native literature b) transportation grid c) cultural traditions d) construction styles

Hilard and clint are seeing a therapist for their sexual difficulties. their homework assignment this week is to caress each other while communicating what is pleasurable to each of them, and to avoid setting any performance goals. this is called the exercise.

Three thieves agreed to rob a bank. the first was to steal a car to be used for the getaway, the second agreed to procure weapons, and the third would check the bank for cameras. the car thief stole a car and parked it in a lot behind his girlfriend's apartment building. while visiting her the night before the robbery, the car thief suffered a series of convulsive seizures. he was rushed to the hospital where he was placed in the intensive care unit and heavily sedated. meanwhile the two other thieves, unaware of their accomplice's illness, met and decided to rob the bank on their own, despite the absence of a getaway car and driver. they robbed the bank, but were quickly apprehended as they tried to escape and implicated the car thief under police questioning.the car thief can be charged with: a theft of the car only.b conspiracy to commit robbery and theft of the car only.c robbery and theft of the car only.d theft of the car, conspiracy to commit robbery, and robbery.