Please help I’m stuck on this

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

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Find the distance between the pair of points a(-1,8) and b(-8,4)