Precalc
posted by Grace .
Suppose vector a is 3 units long, the magnitude of vector b is 1 units and cos (θ) = 0.3, where θ is the angle between the two vectors when they are placed tailtotail. What does the inner product of vector a and vector b equal?

a.b = a*b*cosθ
= 3 * 1 * (.3) = .9