Answer:

Step-by-step explanation:
Initially, the difference between the rod's and the water's temperatures is 100°
i.e D(t)=100 When t=0
After 1 seconds, the temp drops by 60%.
Therefore, the new value of D will be the old value multiplied by (100-60)%.
D(1)=100 X (100%-60%) = 100*0.4
After 2 seconds, the temp difference would be:
D(2)=100*0.4*0.4= 
We notice that for any t, the percentage at which the difference is reduced is raised to the power of t.
Therefore, temperature difference in degrees Celsius, D(t), t seconds after the rod was plunged into the water is given as:
