1 I think not too sure tho
At midnight the temperature was 31.2 degrees above 0 and in the morning it was 6.7 degrees below 0.
I believe using the equation v=lwh the answer would be 420ft^3.
The general formula for the distance between two points is

Anyway, if A and B have the same x or y coordinates, this formula can be simplified. For example, in this case the two points have the same x coordinate of -8, so the following part of the formula simplifies:

So, we're left with

but the square root of a square is the absolute value of the object being squared:

which is this case means 
which is the correct length of the side.
Answer:
D.
is the correct answer.
Step-by-step explanation:
The given situation can be represented as a figure attached in answer area.
B is the base of tree.
C is the base of wires.
A and D are the end of 2 wires supporting the tree.

Here, we need to find the Height of the tree which is represented the by side AB.
and we are given that bases of wires and tree base are at a distance 4 ft.
i.e. side BC = 4 ft
If we look at the
, we are given the base BC and the
, and the perpendicular is to be find out.
We can use trigonometric identity:


Hence, D.
is the correct answer.