It is -20 + 11t. Its numerical value will depend on the value of t, which is not disclosed.
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If you mean t^2 +11t +10 then it is (t+10)(t+1) when factorized
20 + + 20 + 20 = 60
491
this is clearly a trick question. 20 plus 20 plus 20 is equal to 60 and there is 60 minites in 1 whole hour so 20 plus 20 plus 20 is equal to 1.
20 x 7 = 20 + 20 + 20 + 20 + 20 + 20 + 20 = 140 The answer is 140.