Find all possible value or value of in the quadratic equation 2n^2-7n+6=0

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244