What is the greatest common factor of 15 and 647? please help me

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

The length of a rectangular piece of land is 92 yards more than three times its width. the perimeter is 760 yards. find its dimensions.