Pleasse i relly need i beg it urgent

The solution fo image problem
Volume= height x width x depth
Volume (cube)=side³
a)
Vt=total volume
V₁(1 foot)=(1 foot)³=1 foot³
V₂( x feet)=( x feet)³=x³ feet³

Vt(x)=V₁+V₂=(1+x³)  feet³

Solution: Vt(x)=(1+x³)
Vt= total volume of two cubes

b)x³+1=(x+1)(x²-x+1)
      1         0       0      1

-1            -1        1     -1
 
       1       -1       1       0
c)
if x=3 feet.
V(3)=1+3³=1+27=28 feet³

Solution: if x=3 feet ⇒V=28 feet³

The solution of your comments

A)
V(a,b)=(2a)³+(3b)³=8a³+27b³
V(a,b)=8a³+27b³

B)
(x³+y³)=(x+y)(x²-xy+y²)
V(a,b)=8a³+27b³=(2a+3b)(4a²-6ab+9b²)
V(a,b)=(2a+3b)(4a²-6ab+9b²)
C)
a=2 foot
b=4 foot
V(2,4)=2³+4³=8+64=72 feet³

Need more information to solve it

Ifigured it out from watching a khan academy video , i am so sorry about the first answer. but i agree that x= 72. and now you can give the other person brainliest if you want.