Answer:
x or ??? =497.08 
Step-by-step explanation:
 
        
             
        
        
        
Answer:

Step-by-step explanation:
To calculate the angles of the given triangle, we can use the law of cosines:

Then, given the sides a=2, b=9, and c=8.

For B:

 
 
        
             
        
        
        
Answer:
a and b.
Step-by-step explanation:
I’ll explain by giving an example.
Let’s say that: a=3;b=4;c=5; => they all are consecutive -> their sum is 12.
=> if we use a) n=3 => 3*n+3=3*3+3=12 => correct.
b) n+(n+1)+(n+2)= 3+4+5=12=> correct.
c)n+2n+3n=3+6+9=18=>incorrect.
d)3n=3*3=9=>incorrect.
 
        
             
        
        
        
X / (-4) + ( -63) = -45 <=> x / ( -4) = 63 - 45 <=> x / (-4) = 18 <=> x = 18 * (-4) <=> x = -72.
        
                    
             
        
        
        
Answer:
The equation of the line is 2 x - y + 5 = 0.
Step-by-step explanation:
Here the given points are A( 1, 7) & B( -3, - 1) -
Equation of a line whose points are given such that
(  ) & (
 ) & (  )-
 )-
 y -  =
  =  ( x -
   ( x -  )
  )
i.e. <em> y - 7=  ( x- 1)</em>
  ( x- 1)</em>
<em>       y - 7 =   ( x -1)</em>
 ( x -1)</em>
<em>       y - 7 =  2 ( x - 1) </em>
<em>       y - 7  =   2  x - 2</em>
<em>       2 x - y + 5 = 0</em>
Hence the equation of the required line whose passes trough the points ( 1, 7) & ( -3, -1)  is 2 x - y  + 5 = 0.