Five bikers join a race. In how many possible ways can they be arranged as first, second and third placers?
1. How many positions to be filled?​

6n^2-7n-75=0 solve by quadratic formula

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

Find two consexutive odd integers such that the sum of their square is 650