exam Maths Puzzle Numerical Ability

The road has 10% grade.
a) what is the angle of elevation of the road?
b) if the road is 2km long, how much does it rise?

i got 5.7 for question A, but i couldn't figure out h

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exam Other Question

Find the slope of the line that contains the points (2.346, �0.215) and (4.492, �3.322). Round to the nearest thousandth. Match your result to the correct answer below.
A) �0.517
B) 0.517
C) �1.448
D) 1.448 ((-6.9+7.7)/-2 )+1

OK this one I am totally LOST. I do not no what any of this means what is the (( and the /-2 mean?? I cant even find this in my textbook. Can someone please explain to me how this problem is actually work out? Thank you much.