book Maths Puzzle Numerical Ability

Is {{{(sqrt(x))^2 = x }}}an identity (true for all nonnegative values of x)?
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graph y= 7x state the y-intercept Hello,

My name is Kristin and my time for the college placement exam is approaching and I need help!!!!!so please help

THE SQUARE OF 50p^16q^8=

THANK YOU IN ADVANCE,
KRISTIN