The graph represents two complex numbers, z1 and z2, as solid line vectors. Which points represent their complex conjugates? Point represents the complex conjugate of z1, and point represents the complex conjugate of z2.

Which of the following expressions are equivalent ?

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?

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.