find the differential equation of the following numbers (1, 2 and 3)
Extracted text: 1. A thermometer which has been at the reading of 70°F inside a house is placed outside where the air temperature is 10°F. Three minutes later it is found that the thermometer reading is 25°F. Find the thermometer reading after 6 minutes. 2. A certain population of bacteria increases continuously at a rate that is proportional to its present number. The initial population of the bacterial culture is 140; it jumped to 720 bacteria in 4 hours. How many bacteria will be present in 10 hours and how long will it take the population to double? 3. Find the general solution of the DE: y" + 4y'+ 4y 0.