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:

 
        
             
        
        
        
X=6
16 plus 2 is 18 and divided by 3 is 6
        
                    
             
        
        
        
Answer:
number one is 3 Step-by-step explanation:
number 2
 the answer is 2
number 3
answer is 42
number 4 answer is 15
 
        
             
        
        
        
Answer:
x=7/2  x=7/3
Step-by-step explanation:
 
        
             
        
        
        
Answer:
- 48
Step-by-step explanation:
If you want to learn more about this concept, it's called composition of functions.
First, you plug in g(x) as if it were x into f(x). 
f(g(x))= -5 (1/2x + 4) + 2
= -5/2x - 20 + 2
= -5/2x - 18
Then, plug in the value given, as x. 
= -5/2 (12) - 18
= -30 - 18
= - 48
I hope this helped!