book Maths Puzzle Numerical Ability

round 20.615 to the nearest tenth
Thank You please HELP!!!!!!!!!

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book Other Question

which ok the following are the factors of m2-14m+48

(A). (m-6)(m-8) (C). (m-12)(m+4)

(B). (m-12)(m-4) (D). (m+6)(m+8) If a and b are distinct real numbers such that a-b and a^2-b^2 are rational, must a and b be rational?