exam Maths Puzzle Numerical Ability

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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?

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exam Other Question

One day the temperature at 8:00 am was 41F and by 1:00Pm the temperature was 61F. What was the hourly rate of temperature change?

Please help me do this I have no idea.

Thanks 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