exam Maths Puzzle Numerical Ability

Is the squ rt of x (squared) = x an identity (true for all values of x)?
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exam Other Question

A rancher wants to fence a rectengular area next to a river, using 150 yards of fencing.

a) determine a formula in one variable for the area A(x)

b) at what value of x will t solve the linear system using elimination

1/4x-2/3y=7
1/2x+2/3y=-4