It's unclear what the planes are supposed to be, so I'll take 
and 
with 
.
The cross sections are disks with diameter 
, so each disk of thickness 
has a volume of
Then taking infinitesimally thin disks, we find the solid has a volume of
Since
and
it follows that the volume is
Answer:
80% or 4/5
Step-by-step explanation:
There are five numbers and four of the numbers are positive which means you'll have 4 out of 5 chance getting a positive number, which is equivalent to 80%
It will take 36 days for 20 men to complete the building
Answer:
Second option: 81y^4 - 16x^2, the difference of squares
Step-by-step explanation:
(9y^2-4x)(9y^2+4x) is a special product named difference of squares, then we can apply this formula:
(a-b)(a+b)=a^2-b^2, with a=9y^2 and b=4x, then:
(9y^2-4x)(9y^2+4x)=(9y^2)^2 - (4x)^2
(9y^2-4x)(9y^2+4x)=(9)^2 (y^2)^2 - (4)^2 (x)^2
(9y^2-4x)(9y^2+4x)=81y^(2*2) - 16x^2
(9y^2-4x)(9y^2+4x)=81y^4 - 16x^2
