Answer:
3
Step-by-step explanation:
Answer:
The brother would be 13
Step-by-step explanation:
14 - 6= 8
There's an 8-year difference
21 - 8= 13
Answer:
687
Step-by-step explanation:
Answer:
Option d is correct.
Domain = all real number
range = positive real numbers
Step-by-step explanation:
Given the function: 
Domain of the function is all real numbers except where the expression is undefined.
In this case, there is no real number that makes the expression undefined.
Domain of f(x) =
= {a | a∈R}
Range is the set of all valid f(x) values.


Therefore, Domain is all real number and the range of function is positive real number