Which expressions represent rational numbers? check all that apply

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

If f(x)=1/x and g(x)=x+4 which of the following is the graph

Asif spent $745.10 on 13 new file cabinets for his office. small file cabinets cost $43.50 and large file cabinets cost $65.95. write and solve a system of equations to find the number of small cabinets and large cabinets he purchased. determine if each statement is true or false. 1. he purchased 5 small cabinets. true or false 2. he purchased 7 large cabinets. true or false 3. he spent $527.60 on large cabinets. true or false