Work out the area of the triangle :)

Show working out plz:)

Awrestling tournament begins with 128 competitors. in the first round, each competitor has 1 match against another wrestler. the winner of each match moves on to the next round until there is a winner. write a sequence in which the terms represent the number of players still in the tournament at the end of each round. describe the sequence? how many rounds are in the tournament?

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

Twelve less than a number is at most 20