Notice that

So

if
, and the answer would be C.
I only know 1 & 4 .. 2 & 3 seem hard to me ..
X >7
X< -7
-
Answer:
1a = 8 cu. in.
1b = 48 cu. yd.
1c = 15 cu. ft.
2a. 36 cu. yd.
2b = 126 cu. ft.
2c = 90 cu. ft.
3a = 112 cu. in.
3b = 60 cu. yd.
3c = 189 cu. ft.
Step-by-step explanation: