exam Maths Puzzle Numerical Ability

I have gotten lost on this one please help.

For the equation x-sqrtx=0 , perform the following:
a) Solve for all values of x that satisfies the equation.

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exam Other Question

Find two consecutive intergers such that the sum of 2 times the first interger and 4 times the second interger is 46. I am absolutely speechless with this problem. I have asked everyone I know and looked for help and nothing. Please help me.

The problem is:

V=(pi)R^2h-(pi)r^2h Solve for r^2