If cos x=-4/5 and tan x>0, the value of sin x is

the expression (1.26)2t reveals the approximate rate of increases in the number of plants semiannually.

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answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

shorter then the tree