To clean the fish tank 3/4 cups of disinfectant is needed for every two gallons of water how many cups of disinfectant are needed for 20 gallons of water

Find the value of x. give reasons to justify your solutions! h ∈ ig

Which of the following parabolas opens down?

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.