Y=− |2x+5| − |2x−5|

if x<−2.5

if x>2.5

if −2.5≤x≤2.5

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

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.

Which is the focus of a parabola with equation y2=4x