Answer:
 
 
Step-by-step explanation:
 ÷
 ÷  
 
The reciprocal of   is 3, so finding the reciprocal will replace the division sign with a multiplication sign.
 is 3, so finding the reciprocal will replace the division sign with a multiplication sign.
 =  x 3
 x 3 
 =  or 1
 or 1 or 1.5
 or 1.5
 
        
             
        
        
        
Answer:
-3 +8a
Step-by-step explanation:
(3-8a) *(-1)
Distribute
3*-1  -8a*-1
-3 +8a
 
        
             
        
        
        
Answer:
The matrix is not invertible.
Step-by-step explanation:
We are given the following matrix in the question:
![A =\left[\begin{array}{ccc}-5&0&1\\-1&3&2\\0&10&6\end{array}\right]](https://tex.z-dn.net/?f=A%20%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-5%260%261%5C%5C-1%263%262%5C%5C0%2610%266%5Cend%7Barray%7D%5Cright%5D)
Condition for invertible matrix:
A matrix is invertible if and only if the the determinant is non-zero.
We can find the determinant of the matrix as:
![|A| = -5[(3)(6)-(2)(10)]-0[(-1)(6)-(2)(0)] + 1[(-1)(10)-(3)(0)]\\|A| = -5(18-20)+(-10)\\|A| = 10-10\\|A| = 0](https://tex.z-dn.net/?f=%7CA%7C%20%3D%20-5%5B%283%29%286%29-%282%29%2810%29%5D-0%5B%28-1%29%286%29-%282%29%280%29%5D%20%2B%201%5B%28-1%29%2810%29-%283%29%280%29%5D%5C%5C%7CA%7C%20%3D%20-5%2818-20%29%2B%28-10%29%5C%5C%7CA%7C%20%3D%2010-10%5C%5C%7CA%7C%20%3D%200)
Since the determinant of the given matrix is zero, the given matrix is not invertible.
 
        
             
        
        
        
4 - (0) = y
4 - 0 = 4      y = 4
4 - (1) = y
4 - 1 = 3     y = 3
4 - (2) = y
4 - 2 = 2     y = 2
4 - (3) = y
4 - 3 = 1     y = 1