Actually, i think something is missing here:
You need either a parenthesis or some dots at the end to determine this. A repeating decimal can have one repreating digit:
0.(7): 0.777777...
two:
0.(45): 0.45454545454545....
or more: so potentially all of them can be repeating, even a!
it could be: 1.(111114)
or: 1.111114111114111114111114111114111114111114111114111114111114111114111114111114...
proably B. is the most typical of repeating decimals (choosed this one if you have to), but in reality, you need more information... did you copy the question exactly?
Answer:
-70x + 21
Step-by-step explanation:
1-8(10x-3)
-7(10x-3)
Use distributive property
-70x + 21
(This is how we learned to do it in my school)
Answer:

Step-by-step explanation:
We are given that tow whole number a and b
ab=30
a:b=2:3
We have to find a and b.



Substitute the value of a




We take the value of positive because b is a whole number
Substitute the value of 

Hence, 
Step-by-step explanation:
el resultado le puedo ayudar si sabe Spanish
The original number would be 7.5