What fraction is equivalent to 12.5%

What is the rescursive formula for this geometric sequence? 7, -14, 28, -56

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?