Express 216 with an exponent and the base 6

Choose the triangle with x equal to 17.

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.

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length