What's the sum in simplest form of (-7s+8b+6) + (5s-3b)

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

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.

What percent of 18 is 24? and plz explain thx.