exam Maths Puzzle Numerical Ability

2x^2+6x+9=0 (finding the value of the discriminant) How many real solutions are there of this equation? I have no idea how to do this question. Please help me

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A roof rises 8.5 ft over a horizontal distance of 18.02 ft. What is the slope of the roof to tje nearest hundredth? The area of a square is a 1/4 as large as the area of a triangle. The triangle has a 16 inch side and altitude H the same as the square. Draw the diagrams. Find the length of the side of the square.