exam Maths Puzzle Numerical Ability

Please someone, Help!!!

Simplify. Assume x represents a positive number.
Square root of 175x to the 4th power.

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exam Other Question

y=1/3x + 1/2

determine wether the lines are parallel, perpendicular or neither

i have a lot of problems working with fractions I need help in finding K so that there is no solution.

x+3y=K
kx+y=-1

this is what I have done
x=k-3y
kx=-1-y
k(k-3y)=-1-y
K^2-3ky=-1-y
k^2=3ky-1-y
k^2=3k-1