Answer:
Option c
 
Step-by-step explanation:
First multiply matrix A by -7.
Then multiply the matrix B by -6.
When multiplying a matrix by a number x you must multiply each element of the matrix by x.
<em><u>Then we perform operation -7A
</u></em>
 
<u><em>Now we perform operation -6B
</em></u>
 
Now we add the resulting matrices

 
        
             
        
        
        
Let, the number = x
Then, 2(x + 10) = -20
2x + 20 = -20
2x = -20 - 20
x = -40/2
x = -20
In short, The number would be: -20
Hope this helps!
        
                    
             
        
        
        
(3,3.87),(6,7.74)
slope = (7.74 - 3.87) / (6 - 3) = 3.87 / 3 = 1.29
An additional year is associated with an additional 1.29 feet of growth