Can someone me with this question?

Asquare parking lot has 6,400 square meters what is the length in meters

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

Write the equations in logarithmic form 9^4=6,561