Question

3- Simplify the following using indices
2 x 7 x 7 x 7 x 7 x 11 x 11
2 x 2 x 2 x 2 x 4 x 4 x 4 x 4 x 4 x 5 x 5
4. Find the value of z in each of the following.
a) 312+2) = 81
b) 2-2 128-1
5- Expand the following and simplify where possible.
a) 39(2 + 7r) + 2r(3 + 4q)
b) -5(x + 4).
6- Solve the simultaneous equation
a + 2b = 10
a - 2b = 6​

Answer 1

Answer:

Step-by-step explanation:

3) 2,37,99,48,03,200

4) a) 312+2=81

    314=81

    314-81=z

     233=z

b)  2-2128-1=z

    -2,127=z

5) a) 78 + 273r + 6r + 8qr

       78 + 279 + 8qr

b) -5x - 20

6) a + 2b = 10

   a + b = 10/2

   a + b = 5 ---------- equ 1

   a - 2b = 6​

   a-b = 6/2

   a - b = 3 ------------ equ 2

Substract equ 1 by 2

a + b = 5

a - b = 3

2a = 8

a = 8/2

a = 4

put a value for equ 1

  a + b = 5

  4 + b = 5

   b = 5-4

    b = 1

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