Asociative property of multiplication
Answer:

Step-by-step explanation:
The slope-intercept form of an equation of a line:

m - slope
b - y-intercept
We have the slope
and the point (-2, 4).
Put them in the equation of a line:

<em>add 4/5 to both sides</em>

10 x 10 x 10, I believe this is the form you mean.
Answer:
18 feet
Step-by-step explanation:
The difference in elevations is ...
-12 -(-30) = -12 +30 = 30 -12 = 18 . . . feet
The ray is 18 feet above the whale.