The lines graphed below are perpendicular. The slope of the red line is -2. What is the slope of the green line?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

Which of the following vectors are orthogonal to (2,1)? check all that apply