What is the location of the vertex of the parabola defined by f(x) = −x2 + 8x − 21 and in what direction does the parabola open?

Data are collected to see how many ice-cream cones are sold at a ballpark in a week. day 1 is sunday and day 7 is the following saturday. use the data from the table to create a scatter plot.

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Secant be and cf intersect at point d inside a what is the measure of cde