What is the equation of the quadratic graph with a focus of (3, 6) and a directrix of y=4

Check the picture below.

one thing to notice is that, the directrix is the horizontal line y = 4, meaning is a vertical parabola, and thus the squared variable is the "x".  The directrix is below the focus point, meaning the parabola is opening upwards, it also means that the "p" distance is positive, in this case  p = 1.

The vertex is always half-way between the focus point and the directrix, in this case is at (3,5).

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet