There are 5 balls, 3 red, and 2 black. what is the probability that a random ordering of the 5 balls does not have the 2 black balls next to each other

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.