I do not agree. If you divide 240 by 30, it would be 8 heartbeats, which is absurd. It's impossible for something to survive with 8 heartbeats per 30 seconds.
In order to get the CORRECT answer, divide 240 by 60 seconds.
This would give you 4 heartbeats per second. 
Then, multiply it by 30 seconds, which would give you 120 heartbeats.
CORRECT answer: 120
        
             
        
        
        
Answer:
0 < t < 
After 1.67 days the stocks would be sold out.
Step-by-step explanation:
The price of a certain computer stock after t days is modeled by 
p(t) = 100 + 20t - 6t²
Now we will take the derivative of the given function and equate it to zero to find the critical points,
p'(t) = 20 - 12t = 0
t = 
t =  days
 days
Therefore, there are two intervals in which the given function is defined 
(0,  ) and (
) and ( , ∞)
, ∞)
For the interval (0,  ),
),
p'(1) = 20 - 12(1) = 20
For the interval ( , ∞),
, ∞),
p'(2) = 20 - 12(2) = -4
Positive value of p'(t) in the interval (0,  ) indicates that the function is increasing.
) indicates that the function is increasing.
0 < t < 
Since at the point t = 1.67 days curve is showing the maximum, so the stocks should be sold after 1.67 days.
 
        
             
        
        
        
A priori means as things were in the beginning or at the start.
a posteriori means as things are after any event.
        
             
        
        
        
Answer: 8/5 or 1 3/5
Step-by-step explanation:
2/5 + 2/5 + 2/5 + 2/5
8/5 which is 1 3/5