Find the coordinates of the midpoint between point a(-5, -9) and the origin

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?

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?