exam Maths Puzzle Numerical Ability

can you tell me if this is the correct answer
simplify (6x^3+5x^2-2)-(11x^3-2x+8)=6x^3-11x^3+5x^2+2x-2-8=5x^3+5x^2+2x-10

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AT 7 a.m. the temperature was -15 degrees F. By 1 p.m. the temp. increased by 18 degrees F. What was the temp. at 1 p.m.? 15x-20 factor it completly, please.