book Maths Puzzle Numerical Ability

is -0.4 rational or irrational?

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book Other Question

Find the distance between the points (3,17) and (-2,5)

a: 13
b: sq. rt. of 145
c: sq. rt. of 458
d: 3 sq rt. of 51
e: none of these 24a-8-10a=-2(4-7a)