The first 5 multiples of 15 are: 0, 15, 30, 45, 60
0.4 * x = 68
x = 68/0.4
x = 170
check:
0.4 * 170 = 68
Answer:

Step-by-step explanation:
Given function:

As per question statement:
Initial temperature of bottle is 70
.
i.e. when time = 0 minutes, f(t) = 70 

After t = 3, f(t) = 42

Hence, the value is:

Answer:
I believe its 45 degrees.