Answer:
2
Step-by-step explanation:
The tangent is positive in quadrants I and III. There are two angles with that tangent value:
33.96° and 213.69°
Answer:
distance is 11.3137 units
Step-by-step explanation:

hopefully it makes sense
:)
Answer:
$9.85
Step-by-step explanation:
7+2.85
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:
