The area of a trapezium is 247 cm2 and the distance between its parallel sides is 13 cm. If one of the parallel sides is of length 21 cm, find the length of the other side.
Find the area of an isosceles triangle ^@ X Y Z ^@ in which ^@ Y Z = 6 \space cm ^@ and ^@ X Y = X Z = 5 \space cm ^@. If ^@ Z W \perp X Y ^@, find ^@ Z W ^@.
Kimberly got an average score of 84.25 in 4 tests. She got 85 as the average of the highest 3 scores, and her lowest two scores are the same numbers. What is the average of her highest two scores?