It is B. and i would answer it!!!!!!
HOPE THIS HELP!!!!!! :)
(i just changed my answer)
sqrt is the square root of
v=sqrt(2(ke)/m)

solve for "k", to find the "constant of variation",
then plug it back in the y = kx, to get the equation
now
what's is y when x = -1?
well, just plug that in the equation with the found "k" value,
to get "y" :)
The 2 triangles are congruent
For this case we have, by definition:

So, we have:

On the other hand we have that by definition:

Thus, the expression can be written as:




So, we have:

Answer:
