Write an inequality to describe the region. the solid upper hemisphere of the sphere of radius 9 centered at the origin

  z ≤ √(81 -x² -y²)

Step-by-step explanation:

If the sphere is described in 3-D coordinates as ...

  x² +y² +z² = r²

Then the upper surface is ...

  z = √(r² -x² -y²)

With r=9, the solid volume below that surface and above the x-y plane is ...

  z ≤ √(81 -x² -y²)

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,