Chapter 3, Problem 7Q

To determine

To check:

 Whether the given equations are valid.

a) $\overrightarrow{\mathrm{a}}+\left(\overrightarrow{-\mathrm{d}}\right)=\overrightarrow{\mathrm{c}}+\left(\overrightarrow{-\mathrm{b}}\right)$

b) $\overrightarrow{\mathrm{a}}=\left(\overrightarrow{-b}\right)+\overrightarrow{\mathrm{d}}+\overrightarrow{\mathrm{c}}$

c) $\overrightarrow{\mathrm{c}}+\mathrm{ }\left(\overrightarrow{-\mathrm{d}}\right)=\overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}}$