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The word "Linear" means "of degree one".
negative means opposite therefore -(-21) = 21 so your answer is 21
21 24 means : The time is 21 ( p.m ) and 24 minutes .
A 21 degree angle is acute because it is greater than 0 but less than 90 degrees
It means that it is estimated that the error in a measurement or calculation is not much more than 1 degree Celsius.