book Maths Puzzle Numerical Ability

Find values of c so that the equation will have two solutions, one solution, and no real solution.

x^2+4x+c=0

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book Other Question

well im doing this mcas problem because we get one each week and i wanted to know... How do you find Volume in cubic feet? and how do u find the total surface area? Solve e^-2x + 5 = 12.