Robert stands a top eight 1380 foot hill. He climbs down, which is the bottom of the hill in 30 minutes. What is Roberts average rate of elevation change in feet per minute?

Which system of linear inequalites is represented by the graph?

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Will give a: 122 b: 90 c: 48 d: 180