In R2, a vector a≠0 in the second quadrant makes an angle of 120∘ with the positive x-axis, and a vector b≠0 in the third quadrant makes an angle of 150∘ with the positive x-axis (in the sense that the smaller of the two angles between b and the positive x-axis is 150∘). Find the sum of the angle between a−2b and a and the angle between a−2b and −2b.

10a^3+277a^2-132a-792

step-by-step explanation:

(2a+11)(5a-12)(foil)

=10a^2-24a+55a-132 =10a^2+31a-132

(10a^2+31a-132)(a+6)

=10a^3+60a^2+31a^2+186a^2-132a-792 =10a^3+277a^2-132a-792

i hope this is what you are looking for : )

i pretty sure it is

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5