Answer
a)$\vec{u}\cdot\vec{v}=-10; \cos\theta=-\frac{1}{\sqrt 5}-0.447$
b)$\vec{u}\cdot\vec{v}=-3; \cos\theta=-\frac{3}{\sqrt{58}}-0.394$
c)$\vec{u}\cdot\vec{v}=0; \cos\theta=0$
d)$\vec{u}\cdot\vec{v}=-20; \cos\theta=-\frac{20}{3\sqrt{70}}\approx -0.797$
Work Step by Step
The explanation is:
