Amanufacturing firm has a marketable permit that currently allows for 400 tons of emissions. however, the marketable permit is shrinkable and the firm will only be allowed 300 tons of emissions next year. the manufacturing firm projects that it's actual emissions next year will be 275 tons. it is the best interest of the manufacturing firm to sell permits worth tons of emissions.

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