Let $$A = \left[\begin{array}{ccc} -3 &1 &-3\cr 3 &5 &-3 \end{array}\right].$$ If possible, compute the following. If an answer does not exist, enter DNE.

$4 A + 3 A =$  help (matrices)

$7 A =$  help (matrices)

Choose True False True or False: $(r_1 + r_2) A = r_1 A + r_2 A$ for any two real numbers $r_1$ and $r_2$ and any matrix $A$.