Estimate how many 12-inch rulers will be the same length as a window

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

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