The pattern would be 5,7,12,20,31,45
The value is 21 Because three represents those to variables which both equal to 21.
The measure of angle A is 61 degrees because every triangle is equal to 180 so you would add 80+39 and get 119. Then you would subtract that from 180 and get 61 which is the measure of angle A
Here's the steps
3/4-(1/3) = 0<span>
3/4-1/3 = 0
5/12
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Rule: The sum of any integer and its opposite is equal to zero. Adding two positive integers always yields a positive sum; adding two negative integers always yields a negative sum. To find the sum of a positive and a negative integer, take the absolute value of each integer and then subtract these values.
