Identify the angles (Interior vs Exterior)

Please help! I will give you a heart !

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left