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How to answer the question of material selection process of water bottle? HOW MANY PEOPLE USE IT? A man is 5 times as old as his son 2 years ago the sum of the squares of their age was 114 find the present age of son?answer is 7? If two angles of a triangle are complementary ,then what type of triangle will be formed.? When given the equations x-y=-1, 2y-x=27, x+y =11 how would you use row echelon form to get to the answer (5,6)?