HEP PLEASE Sarah's rectangular dining table has a area of 9000 sq ft and the length is 20 in less then four time the width find the length and width

With #! i’ve tried to figure it out but i can’t.

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

If eh = hg and hg=16, find the diameter of k