Sam is laying out patio stones in a triangular pattern. the first row has 2 stones and each row has 2 additional stones, as shown below. how many complete rows can he make with a box of 144 stones? enter a numerical answer.

Dropping less than two inches per mile after emerging from the mountains, a river drains into the ocean. one day's discharge at its mouth, 5.6 trillion gallons, could supply all of country a's households for seven months. based on this statement, determine how much water an average household uses each month. assume that there are 100 million households in country a. country a uses approximately nothing gallons per household per month.

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)