book Maths Puzzle Numerical Ability

My question says to solve the equation and check the solution.
square root of x=15

Could you help me with this? thanks!

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book Other Question

Ive been trying to work on this problem forever and now i need some help.
The problem is:
Two friends are 60 miles apart. They decide to ride their bicycles to meet each other. S
In which of the following is y a function of x

a. 3y+2x-9=0
b. x+y^2=5
c. x^2+y^2=25
d. noone of these