Afigure skater needs a total score of at least 90 to move on to the next round. the total score is the average of four judges’ scores. the first three judges’ scores were 83, 88, and 92. the figure skater made it to the next round. what is the minimum score the fourth judge could have given? enter your answer in the box.

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Which of the following can be used to explain a statement in a geometric proof?

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.