For the points ^@ A(75, 21), ^@ ^@ B(19, 15), ^@ ^@ C(25, -81), ^@ and ^@ D(35, 32), ^@ find the value of ^@ (\text{abscissa } B) ^@^@+ (\text{ordinate } A) ^@^@+ (\text{ordinate } C) ^@^@+ (\text{ordinate } D) ^@.
The area of a trapezium is 286 cm2 and the distance between its parallel sides is 22 cm. If one of the parallel sides is of length 18 cm, find the length of the other side.
A box contains 4 blue and 3 pink balls. Abigail takes out a ball, puts it back, and then takes out another ball. What is the probability that both balls were blue?