exam Maths Puzzle Numerical Ability

How do I do this problem..thank you*

find the distance between -1/4 and 3/5

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exam Other Question

Graph x = 3
of course there is a graph but not sure how it is supposed to go help.
Solve the equation:

sqrtx+4 = 3

I tried to keep this seperated because the square root is x + 4.

I am going to assume I need to make X equal the 3 leaving me with this:
X= -1
sqrt-1+4 = 3
Is this the right process?