I think that C is true
the diagonals are congruent.
She will have $103, you must multiply 8 by 10, then add 23 and you get 103.
Original prism is 94 cm.
With the dimensions doubled is 376 cm.
You multiply each side of the equation by 16 .
Let's notice, the focus is at (5,0) and the directrix at x = -5.
keep in mind that there's a distance "p" from the vertex to either of those fellows, therefore, if the focus is at 5,0 and the directrix x = -5, the vertex is half-way between them, check the picture below.
notice the distance "p" there, now, is a horizontal parabola, opening to the right, meaning the value for "p" is positive, or just 5, thus