exam Maths Puzzle Numerical Ability

What is the square root of 16x divided by 9x

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exam Other Question

Multiply and match your result to the correct answer below:
(z � 8)(z + 8)
A)z2 + 16
B)z2 � 64
C)z2 � 16
D)z2 � 16y � 64 i need a little help with this problem.

A compass=4, a ruler=4
The compass is 90 more than ruler.
how much does the ruler cost?