Select the correct answer.
which set of vertices forms a parallelogram?
a.
a(2, 4), b(3, 3), c(6, 4), d(5, 6)
b.
a(-1, 1), b(2, 2), c(5, 1), d(4, 1)
c.
a(-5, -2), b(-3, 3), c(3, 5), d(1, 0)
d.
a(-1, 2), b(1, 3), c(5, 3), d(1, 1)

Solve the system of equations. y= 2x y= x^2 - 15

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

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.)