Factor: (please tell me steps)
9x^(4)+21x^(3)-9x^(2)-21x

Fill in the table with whole numbers to make 430 in five different ways

The interior angles formed by the sides of a hexagon have measures that sum to 720°. what is the measure of angle a? enter your answer in the box. m∠a= °

Determine the lengths of the sides of the rectangle using the given area. give answers both exactly and approximately (to the nearest tenth). the area of the rectangle is 46 cm2.