Which of the interpretations for the given expression is correct?



the difference of the square of  x  + 4  and 3

the sum of the square of  x  + 4  and 3

the sum of the square of  x, 4, and -3

the difference of the square of  x  and  4 - 3

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

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.

Who long does it take to drive 150 miles at 45 miles per hour