book Maths Puzzle Numerical Ability

please help me find b^2 - 4ac and the number of real solutions to the equation below
-2x^2 + 5x - 6 = 0

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book Other Question

The length of a rectange is 6 inches less than twice its width. Find the dimension of the rectangle if its ares is 108 square inches.
Thank you Jennifer, Stephanie, and Rosalyn made a total of 60 downhill runs. Jennifer made 18 runs and Stephanie made three fourths as many runs as Rosalyn. How many runs did Rosalyn make?