The answer is C. 100 because the total measure of a quadrilateral is 360. When you add up the 3 interior angle measures, it adds up to 260. Then you subtract 360-260 to get 100 as the fourth angle measure. Hope that this helped!
58 is a composite number because it has more than 3 factors. Composite numbers are numbers that has 3 or more factors. Prime numbers are numbers that only has 2 factors.
