Find the measure of the interior and exterior angle of a regular decagon​

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

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?

What is the perimeter of a rectangle if the length is 5 and the width is x?