exam Maths Puzzle Numerical Ability

Please explain why every irrational number is a real number but not every real number is an irrational number?

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exam Other Question

when solving the system of equations, 3x+y=14
which expression could be substituted x+4y=3
for y in the second equation?

a.3-4y
b.3-x/4
c.14-y/3
d.14-3x How do you complelty factor out, x^2 + 12xy + 35y^2, whats the answer?