Troy engines, ltd., manufactures a variety of engines for use in heavy equipment. the company has always produced all of the necessary parts for its engines, including all of the carburetors. an outside supplier has offered to sell one type of carburetor to troy engines, ltd., for a cost of $35 per unit. to evaluate this offer, troy engines, ltd., has gathered the following information relating to its own cost of producing the carburetor internally:

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