Answer:

Step-by-step explanation:

Lets split the numerator and denominator.

Lets factorise the numerator and denominator.


Cancelling x - 4 from numerator and denominator ,

Answer:
True
Step-by-step explanation:
A rational number means that the number can be expressed as a fraction, where you can have two whole numbers.
There is an equation which is 
Answer: 3.285714286
Step-by-step explanation: subtract 2 from both sides then divide by 7
Answer:
12
Step-by-step explanation:
Since 15 is 3 times the ratio you multiply 4 by 3