3 Grade 12 Math Questions..need some quick help?

Hey guys, well I haven't had math in over a year due to the way my high school is semester up here in Canada. I need help with 3 q's. Some of the steps taken to get the answers would help a lot. Here they are:





1. If the two solutions of the quadratic equation "4x^2 + 4x + k = 0" are equal, then k =


a) 1


b) 0


c) 4


d) a, where a is a real number





2. Bill can paint a wall in 5 hours. Connie can do it in 4 hours. How long would it take them to paint it together?


a) 9/20 hours


b) 4 1/2 hours


c) 20/9 hours


d) 3 hours





3. Translate the following to an algebraic equation using k as the constant of variation:





c varies jointly as d and the cube of e and inversely as the square of f.





a) c = (kd^3e^3) / f^2


b) c = (kde^3) / f^2


c) c = kde^3f^2


d) c = kd3e / 2f





If you don't know all, help with even just one would be great. Steps would be appriciated. :)

3 Grade 12 Math Questions..need some quick help?
1) is a k=1


2) is d 3 hours





sorry i can't be of more help
Reply:This is what I got:





1. B


2. B





But don't come hunt me down if I'm wrong or anything...





Not sure about the answer to #3