For what value of x is the rational expression below equal to zero?
3х + 15
б – x

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If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

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

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?