exam Maths Puzzle Numerical Ability

Suppose X is uknown vector and A is known vector. If A.X= Empty set
A*X= B Find the uknown vector X interms of empty set , B and magnitude of A

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exam Other Question

Tell wether the number is prime or composite,if it is composite write prime factorization.

8. 345

Any help with this problem would be GREATLY appreciated:) graph the system of linear inequalities

3x+4y<12 all < > underlined
x+3y<6
x>0
y>0