exam Maths Puzzle Numerical Ability

Evaluate the sum 17.12 + (-5.23)+ 1.72

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exam Other Question

I am asked to graph the following inequalities: (<= is less than or equal to)
a) the intersection of x+y<=0 and 3x-6y>=12

b) the union of 2x-y>3 or x>0 3,800 divided by 57,900 = 0.656 =7.0% Have I done this right? This rounding to the tenth or nearest tenth of percent reallt confuses me.
Thanks so much for you help,