book Maths Puzzle Numerical Ability

a 21 foot beam is to be divided so that the longer piece is 1 foot more than 3 times the shorter piece find the lengths of both

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book Other Question

find the exact value using the sum, difference, half, or double angle formulas and the exact value char in cos 105 degrees. TELL WEATHER THE RELATIONSHIP BETWEEN X AND Y IS LINEAR,EXPONENTIAL,OR NEITHER AND EXPLAIN THE ANSWER- X-0,1,2,3,4,5 -Y-1,1/4,1/16,1/64,1/256,1/1024 ?