exam Maths Puzzle Numerical Ability

What is an augmented matrix? Give an example based on a system of equations.

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exam Other Question

what expression represents the product of 3 less than and 2 more than the quantity of 3 times x I'm trying to solve the equation of a circle with the following vertics. (0,0), (20,0) and (0,21).

It appears to me that there is no solution. If you plot the points on a graph