Which sets of numbers represent geometric sequences check all that apply

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

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

17 in long 1.3 ft wide and 8in high what is the volume