Help! A jet travels 400 miles in 5 hours. At this rate, how far could the jet fly in 8 hours? What is the rate of speed of the jet?

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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.

Astock has a 25% probability of increasing by $10 and a 75% probability of decreasing by $5. what is the stocks expected increase or decrease?