3. Find x, y, u, and v satisfying the system of four equations: x + 7y + 3v + 5u = 16 8x + 4y + 6v + 2u = -16 2x + 6y + 4v + 8u = 16 5x + 3y + 7v + u = 16

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?

Asphere has a diameter of 10 in. what is the volume of the sphere?

What is the prime factorization of 23 ?me with this question