. For the polynomial function f(x) = -2x^4 + 8x^2 - 8, find all local and global extrema. A: no local extrema exist

B: the only extrema point is (0,-8)

C:no global extrema exist

D: the local and global extrema are: (-/2,0),(0,-8) and (/2,0)

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

10x − 5y + 14 = 0 whats the answer pls