Sorry I'm in high school.. but according to my physics class, the instantaneous speed is when t (time) is 0, or whatever you'd use (like x).. anyways, when t=0, the instantaneous speed would be 3 ft/s, and the instantaneous acceleration is 0.
        
             
        
        
        
If you take your calculator and enter in -82+28 it should give you the answer easily If you dont have one use ur phone. 
Easiest way 1.o.1
        
             
        
        
        
Answer:

The above function value for  shows that height of the ball before it was dropped i.e. at time = 0 seconds.
 shows that height of the ball before it was dropped i.e. at time = 0 seconds. 
The height of the ball above the ground before it was dropped = 400 ft.
Step-by-step explanation:
Given:
The quadratic function that models the height of the baseball above the ground in feet ,  seconds after it was dropped is given as:
 seconds after it was dropped is given as:

To find  and interpret the meaning of the function value in contect of the problem.
 and interpret the meaning of the function value in contect of the problem.
Solution:
In order to find  , we will replace
, we will replace  in the given function as
 in the given function as  is a function of time
 is a function of time  .
.
Thus, we have:



 (Answer)
  (Answer)
The above function value for  shows that height of the ball before it was dropped i.e. at time = 0 seconds.
 shows that height of the ball before it was dropped i.e. at time = 0 seconds. 
The height of the ball above the ground before it was dropped = 400 ft.
 
        
             
        
        
        
Answer:
Part A:

Part B:
The closure property describes cases when mathematical operations are CLOSED. It means that if you apply certain mathematical operations in a polynomial it will still be a polynomial. Polynomials are closed for sum, subtraction, and multiplication. 
It means:
 
  
 
  
 
  
But when it is about division:
 
  
<u>Example of subtraction of polynomials:</u>
<u /> <u />
<u />
<u /> <u />
<u />
Step-by-step explanation:
<u>First, it is very important to define what is a polynomial in standard form: </u>
It is when the terms are ordered from the highest degree to the lowest degree. 
Therefore I can give:

but,
 is not in standard form.
 is not in standard form.
For this question, I can simply give the answer:  and it is correct.
 and it is correct. 
But I will create a fifth-degree polynomial using this formula

Also, note that 

For 


Sorry but I will not type every step for each value of 
The first one is enough.
For 

Doing that for  values:
 values:

 
        
             
        
        
        
<span><span> x =(4-√-104)/6=(2-i√ 26 )/3= 0.6667-1.6997i</span><span> x =(4+√-104)/6=(2+i√ 26 )/3= 0.6667+1.6997i</span></span>