27.5
Plugging in x = 10 into the function T = 70(0.80)^10 + 20 gives us T = 70(0.1073741824) + 20 = 27.5.
A cup of coffee cools according to the function T = 70(0.80)* + 20, where x is the time in
minutes and T is the temperature in degree Celsius.
What is the temperature after 10 minutes?
7.5
20
27.5
76
1 answer