The temperature of a cup of coffeetminutes after it has been poured is described by the function $\displaystyle C(t) = 20 + 60(0.95)^t $.

a. How many minutes does it take for the coffee to cool to a temperature ofddegrees?

b. About how fast is the temperature dropping whent= 1?

For a. is it just: $\displaystyle d = 20 + 60(0.95)^t $??

Could someone help me with both a and b pls?

Thanks.