I only know 8 and half of number 9.
Number 8 is c because volume=length times width times height.Which is 3cm×4cm×10cm.So that equals 120 cm.
The volume for rectangular prism 1 in number 9 is 100 ft.This is the volume for rectangular prism 1 because 5 ft×2 ft×10 ft is 100 ft.The volume for rectangular prism 2 is 800 ft.This is the answer because 10 ft×4 ft×20 ft=800 ft.Hope these help:D Have a nice day!:)
