Celia is scheduled to work a total of 20 hours this week. So far she has worked 75% of her hours. How many hours has she worked so far this week?

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.

Quick graph the line for y+2=32(x+4) on the coordinate plane. does anyone know the cordinates will mark brainliest.

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?