Answer:
8 Gauss
Step-by-step explanation:
Since your moving the magnet from 10 to 20cm you're essentially multpliying the distance by 2.
K = 2
Therefore k ^ 3 = 2^3
64/2^3
=8
3 minus 24 is negative 21
Answer:

Step-by-step explanation:
If a line is perpendicular to a line that has slope m, then the slope of the line is -1 / m.
in this case,
∴
by comparing with 
the slope of the perpendicular line is

use the point-slope form: 
the equation of the perpendicular line is

It's D. The curve intersects the y-axis at (0,10).
ANSWER
The value of this function at x=-1 is 1
EXPLANATION
The given function is

We want to find the value of this function at x=-1.
We substitute x=-1 into the function to obtain:

We multiply out to obtain:


Therefore the value of this function at x=-1 is 1.