book Maths Puzzle Numerical Ability

find teh giometric mean of 5 and 6

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book Other Question

Solve the system by the substitution method.

4x+y=16
16x+4y=64
How do you find the equation of a line from a few points?

Q: Find the equations of both lines.

The solutions of line m are (3,3), (5,5), (15,15), (34,34), (678,678), and (12