For a moving object, the force acting on the object varies directly with the object's acceleration. when a force of 36 n acts on a certain object, the acceleration of the object is 4 /ms2. if the force is changed to 27 n, what will be the acceleration of the object?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

The constant of proportionality is always the where k is the constant of proportionality. additionally, you can find the constant of proportionality by finding the ratio for any point onasap

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.