book Maths Puzzle Numerical Ability

what is the smallest number that is divisible dy four different primes?

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find the slope of the line through the points (2,5) and (-2,3) Hi.
I need help on solving systems of equations using augmented matrix method. The systems are: x + y + z = -2, 2x - 3y + z = -11, -x + 2y - z = 8. Thank you very much for your ti