An arch is in the shape of a parabola with a span of 21 feet and a maximum height of 12 feet. Assuming that the point on the ground below the highest point of the arch is represented by the point (0,0), which of the following gives the equation of the parabola that can be used to model the arch? Select the correct answer below:

x2=−14716(y−12)

y2=−84(x−12)

(y−12)2=−12x

x2=−21(y−12)

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)