Answer:
5 × 
Step-by-step explanation:

Answer:
120°
Step-by-step explanation:
D(7, 3), E(8, 1), and F(4, -1)
We calculate the squared distances between the points:



Since
we have a right triangle with hypotenuse DF.
Yes. but if it has a negative sign in the front of it it is below sea level.