It should be A. 0, because any number with a power of 0 should equal 0. I hope I helped!
Answer:

Step-by-step explanation:
we know that
In the right triangle QRS
----> by SOH (opposite side divided by the hypotenuse)
substitute the given values

solve for SQ

Answer:
The vertex and the axis of symmetry in the attached figure
Step-by-step explanation:
we know that
The equation of a vertical parabola written in vertex form is equal to

where
a is the leading coefficient
(h,k) is the vertex of the parabola
and the equation of the axis of symmetry is equal to the x-coordinate of the vertex

In this problem
we have

This is a vertical parabola written in vertex form open upward
The vertex is a minimum
where
the vertex is the point (5,-7)
the x-coordinate of the vertex is 5
so
the equation of the axis of symmetry is equal to

The graph in the attached figure