exam Maths Puzzle Numerical Ability

My answer for this problem was- rx2 - Could you tell me if I am correct?

Question: Arnold walked r miles. Ralph walked 2 miles farther. Represent the distance Ralph walked. (was my answer correct? If not, can you help me?)

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the difference between 2x^2+4xy-3 and x^2-2xy-4?

My answer is x^2+6xy+1.

Thanks or your time! Sylvia somersaults from a 3 metre springboard. Her height in metres above the water t seconds after she leaves the board is given by the formula h=-4.9t^2+8.8t+3.How lon