Since studies cannot ethically create harmful experiences, like poverty or illness, what is the BEST way to study them? Base the studies on those already experiencing the condition.

There really are no ethical ways so these topics cannot be studied.

If volunteers are willing to be harmed, it is acceptable to use them.

Create experiences that are unpleasant and temporary but not harmful.

Ahospital purchases a $500,000 magnetic resonance imaging (mri) machine that has a useful life of 9 years. the salvage value at the end of 9 years is $77,000. (a) write a linear equation that describes the value y (in dollars) of the mri machine in terms of the time t (in years), 0 ≤ t ≤ 9. (b) find the value, in dollars, of the machine after 6 years. $ (c) find the time, in years, when the value of the equipment will be $140,000. (round your answer to two decimal places.) yr