5. How many 4 digit numbers are possible by using the digits 0, 1, 2, 3, 4, 5? If (a) the repetition of the digits is not allowed?
(b) if the repetition of the digits is allowed? ​

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

Which number line correctly shows 0.8 + 0.3?