1. (07.06 MC) Newton's Law of Cooling states that the rate of change of the temperature of an object, T, is proportional to the difference of T and the temperature of the region, TR or g = k(T TR) An object with core temperature of 1200F is removed from a re and placed in a region with of a constant temperature of 80F. After 1 hour, its core temperature is 830'F. What is the object's core temperature 4 hours after it is taken off the re? ('I point) 0 225.2214? 0 370.4010'F 0 305.2214? 0 145.4010'F 2. (07.06 MC) The volume of a substance, A. measured in cubic centimeters increases according to the exponential growth model % = 0,3,1 where t is measured in hours. The volume of another substance. B. also measured in cubic centimeters increases at a constant rate of '1 cm3 per hour according to the linear model E: 1_ At t = 0, substance A has a volume A(0) = 3 and substance B has size 3(0) = 5. At what time will both dt substances have the same volume? ('I point) 0 0.8614 hours 0 0.9776 hours 0 3.4531 hours 0 3.0303 hours HM UHBngS SEVEU 3. (07.06 MC) The rate at which a particular drug leaves an individual's bloodstream is proportional to the amount of this drug that is in the bloodstream. An individual takes 300 mg of the drug initially. After 2 hours, about 223 mg remain in the bloodstream. Approximately how many mg of the drug remain in the individual's bloodstream after 6 hours? (1 point) 0 145 mg 0 103.4203 mg O 69mg 0 123.2174 mg 4. (07.06 MC) The value of a laptop t years after it is purchased is given by the decreasing function V, where V(t) is measured in dollars. The rate of change of the laptop's value in dollars per year is proportional to the laptop's value. Which of the following differential equations, with the correct description of constant k, could be used to model the value of the laptop? ('I point) 0 % = kn where k is positive. 0 = i where k is negative. 0'! V 0 = E where k is positive. d! k 0 % = kV. where k is negative. 5. (07.06 MC) Bacteria in a culture increase at a rate proportional to the amount present. At time t = 0. there were 650 bacteria present. At time t = 2, there were 1.950 bacteria present. Which of the following equations describes the exponential model in terms oft? (1 point) 0 a. y = 5509T hi_2), y = 6509 3 O a