Question

describe the eqn x^2 + y^2+z^2 is less than 9, for calc 3

Answer 1

-3 < x < 3

Answer 2

A ball of radius 3

Answer 3

i know it is a sphere, though it needs to include something about the interior and center

Answer 4

It's a ball, a sphere is only the outside.

Answer 5

To be precise, since it is less than 3^2 rather than less equal it does not include the surface.

Answer 6

the answer choices were
A. a sphere centered at the origin with radius 3
B. the exterior of the sphere centered at the origin with radius 3
C. interior of sphere centerd at origin with radius 3
D. straight line segment
E none of the above

Answer 7

If u read what I put in my last post, the answer is obviously c ( the inside of a sphere plus its exterior (not one of your choices) is called a "ball" 2nd para here http://en.wikipedia.org/wiki/Sphere)

Answer 8

yeah i was debating between c and none of the above, bc since there is not a less than or equal to inequality, i thought it wud only be in the interior not centered at anythign

Answer 9

http://www.wolframalpha.com/input/?i=x^2%2By^2%2Bz^2%3C9

Answer 10

hope that helps

Answer 11

There are some issues about the centre, they need not concern u for this question.

Answer 12

Here is another link for u to look at
http://www.wolframalpha.com/input/?i=ball

Answer 13

i love wolfram alpha!