exam Maths Puzzle Numerical Ability

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

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exam Other Question

Subtract and write in simplest form:

12 10
---- - ----
z z

I believe the answer is:
2
---
z^2

Is this correct? Thank you
A figure shows the graph of g(x) =e^x and a second exponential function f(x). Identify the second function.

Please explain. Thank you in advance if you can help me