Answer:
The equation of the sphere with center (-2, 3, 7) and radius 7 is
.
The intersection of the sphere with the yz-plane is
.
Step-by-step explanation:
We know that any sphere can be represented by the following equation:

Where:
,
,
- Coordinates of the center of the sphere, dimensionless.
- Radius of the sphere, dimensionless.
If
and
, we obtain this expression:

The intersection of the sphere with the yz-plane observe the following conditions:
,
, 
Hence, the expression above can be reduced into this:

Can yu post the problem? my computer won't open the document
The answer is that y is -3 and x is 0
The first 1 is 42.5%
2nd 1 is 21