What is the mean absolute deviation of the data set? {12, 10, 10, 8, 6, 7, 7, 12}

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?

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.