Identify the vertex, focus, and directrix of the parabola with equation x + y^2 + 4y - 1 = 0. (Hint: Complete the square to find the vertex form
of the equation.)

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?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Can you divide 25 into 4 equal groups? explain why or why not.