If a can of mixed nuts contains 54 nuts including 21 pecans, all we have to do is to let 21 be divided by 54 to find out the probability of selecting a pecan. Ultimately, the answer should be 39%.
The focus is left of the vertex, so the parabola opens to the left. The vertex is halfway between the focus and directrix, so the directrix is the vertical line x = 2
