I think it is .8 i could be wrong i’m not sure
        
                    
             
        
        
        
Answer:
  .
.
Step-by-step explanation:
We have been given that 4 days I have 140 copies of a book, 9 days I only have 50 left. We are asked to write an equation  , where c is number of copies still on hand and t days being available.
, where c is number of copies still on hand and t days being available. 
We have two points on line (4,140) and (9,50). Now, we will use these points to find slope as:



Now, we will use point-slope form of equation  and substitute
 and substitute  and coordinates of point (9,50) as:
 and coordinates of point (9,50) as:




Therefore, our required equation would be  .
.
 
        
             
        
        
        
Answer:
the correct answer is 0.84
give brainliest plzzz
 
        
             
        
        
        
Answer: x=0.6435011
Step-by-step explanation:
Take the inverse tangent of both sides of the equation to extract  
x
 from inside the tangent.
x
=
arctan
(
3
4
)
Evaluate  
arctan
(
3
4
)
.
x
=
0.6435011
The tangent function is positive in the first and third quadrants. To find the second solution, add the reference angle from  
π
 to find the solution in the fourth quadrant.
x
=
(
3.14159265
)
+
0.6435011
Simplify the expression to find the second solution.
Tap for more steps...
x
=
3.78509376
Find the period.
Tap for more steps...
π
The period of the  
tan
(
x
)
 function is  
π
 so values will repeat every  
π
 radians in both directions.
x
=
0.6435011
+
π
n
,
3.78509376
+
π
n
, for any integer  
n
Consolidate the answers.
x
=
0.6435011
+
π
n
, for any integer  
n
 
        
             
        
        
        
41-28=13 questions, but you also have to do 41 and 28, so 15 questions