Answer all 4 questions attached below 
1. Throughout this exercise set, assume a

Answer all 4 questions attached below 
1. Throughout this exercise set, assume all variable represent positive real numbers and that all radicands are nonnegative. 
Simplify.
see attachment below- answer question 13 ONLY
2. Throughout this exercise set, assume all variable represent positive real numbers and that all radicands are nonnegative. 
Simplify.
see attachment below- answer question 25 ONLY
3. Throughout this exercise set, assume all variable represent positive real numbers and that all radicands are nonnegative. 
Simplify.
see attachment below- answer question 35 ONLY
4. Throughout this exercise set, assume all variable represent positive real numbers and that all radicands are nonnegative. 
Simplify by rationalizing the denominator.
see attachment below- answer question 68 ONLY