Answer:

Step-by-step explanation:
The volume of a box is equal to the length l times the width w times the height h.

Substitute the values of the length l=8, the width w=2, and the height h=4 into the formula.

Multiply 8 by 2.

Multiply 16 by 4.

Hence, the volume of the rectangle prism is 64(in)³.
Answer:
36
Step-by-step explanation:
Answer:
Since r is the distance from the origin to (x,y), it is the magnitude r=√x2+y2. Alternatively, from the equation (1), one can calculate directly that x2+y2=r2cos2θ+r2sin2θ=r2(cos2θ+sin2θ)=r2.
Step-by-step explanation:
By the divergence theorem,

where

is the boundary of

. We have

so the flux is
-1/4 the negative reciprocal of the slope of the red line