What is the least common denominator for the fractions 9/14 and 2/21

Find the multiplicative inverse of 8-12i

Which system of linear inequalities is represented by the graph?

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick