HELP QUICK!! if you know that one figure has a greater surface area than another, do you know whether it has a greater volume

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

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

I'm confused on this could anyone me and show me what i need to do to solve it.