three quarters of the students are boys and the rest are girls. what is the ratio of boys to girls in the classroom.

How many days was the temperature above 90 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.

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2