Answer:
Therefore, the Forest Service will open trials on April 23rd.
Step-by-step explanation:
On January 15th, snow pack = 150 inches.
Snow pack decreases 11 inches per week.
The trials for hiking would be opened when the snow will be gone.
The snow will be gone in the number of weeks it takes to decease.
Number of weeks required = 
= 13.64 weeks
Number of weeks required ≅ 14
Thus, it would take a maximum of 14 weeks for the snow to be gone from January 15th.
Therefore, the Forest Service will open trials on April 23rd.
I think this is Pythagoras' theorem you are asking for
a^2+b^2=c^2
87^2+387^2=157338
Square root of 157338 = slope = 396.6585
396.66 ft
Answer:
Circle B:

Circle F:

Step-by-step explanation:
We can write the equation of a circle equation with center on (h,k) and radius r as:

Then, we analyze the circle will have for the circle B:
- It has a center in x=-4 and y=-3.
- It radius can be calculated from the distance from the center (x,y)=(-4,-3) to one of its points (x,y)=(-4, -1). Then, its radius is r=2.
Then, we can write the equation as:

we analyze the circle will have for the circle F:
- It has a center in x=4 and y=1.
- It radius can be calculated from the distance from the center (x,y)=(4, 1) to one of its points (x,y)=(0, 1). Then, its radius is r=4.
Then, we can write the equation as:

(x - 39) + (x + 61) = x - 39 + x + 61 = (x + x) + (-39 + 61) = 2x + 22
I think it is D but i'm not positive hope this helps