What is the equation of the axis of symmetry for the parabola y equals negative start fraction one over two end fraction left parenthesis x plus three right parenthesis squared minus five? x=-5 x=-3 x=-1/2 x=3the answer is -3 i just took the test 

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