which is the equation of a parabola with a directrix at y = 2 and a focus at (5, 0).

y = one fourth(x − 5)2 + 1
y = one fourth(x + 1)2 − 5
y = −one fourth(x + 1)2 − 5
y = −one fourth(x − 5)2 + 1

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.