Two cars start at a given point and travel in the same direction at average speeds of 42 miles per hour and 52 miles per hour how far apart will they be in 4

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?

Can someone answer this question for me

X-10/4 when x = –18 a 7 b –2 c –7 d 2