Which expression is equivalent to is Measure of angle 4?

A Measure of angle 2 + measure of angle 3
B Measure of angle 1 + measure of angle 2
C Measure of angle 1 + measure of angle 3
D Measure of angle 5 + measure of angle 6

Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81

What is the quadric regression equation that fits these data

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?