Math Is Fun Forum

Im actually struggling on 2 other very basic equations, im watching the tutorials on utube on integration but I cant figure this one out because it looks to simple and all examples are very complex:
         5 
Solve ∫  1 dx
         1  x
and solve:

5
∫ dx
1

Hi

QUESTION 1

A
Can anyone answer these questions? And show working out...

If 
    A = (2  -1  0       ,  B = (3      ,      C = (1  6  5
          -1   1  6)                 2                    3   4  1)
                                        4)

Find, where possible: 3A-B, AB and CA

B

Let     
      E= (2  5     and   F = (4  -5
           -3  1)                   3   k)

For what values of k, if any, does EF=FE

Find the inverse of E and hence solve:

2x + 5y = -4
-3x + y = 7

C

Let M =  (0  1  2
              1  0  3
              4 -3  8)

Find the determinant and inverse of M

hence solve the system:

y + 2z = -11
x + 3z = -20
4y - 3y + 8z = -61