Answer:

Step-by-step explanation:
Given

To express as a rational number with 91 on the denominator.
91 ÷ 7 = 13
Thus multiply the numerator and denominator by 13, that is
= 
Answer:
I don't know about 4 but of no. 6, it is A
Step-by-step explanation:
The answer is -130. hope this helps.