exam Maths Puzzle Numerical Ability

Add the following(z+3 over 2) +(7 over 2)

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exam Other Question

1/(x- square root 5)

thank you for your help :]
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?)