Grade 12 math please answer the questions

Instruction: Show all the steps used to solve each question 3. Hillary walks to work in the winter with a cup of coffee. 1. A sample of iodine-125 undergoes radioactive decay. The equation M - 25(0.976) The cup of coffee's temperature, T degrees Celsius, after m minutes is modelled by gives the mass M grams of iodine-125 remaining after t days. Determine the initial mass and the mass remaining after 70 days. [ the equation 7- 85(4) . Determine how long it takes for the temperature of the coffee to reach 22 C. 2. A new town doubles in population every 4 years. Its population is modelled by the equation P= 1000(2) 7, where t is the number of years since the town's founding. How long will it take the population to reach 64 000? 4. Kleiber's Law states that the energy required per day, P kilocalories, for an animal with mass M kilograms, is given by the formula p - 70M* . The energy required by a human is 1800 kcal per day. Determine its body mass. Explain your strategy