Answer:
Step-by-step explanation:
[tex]u=5i-j\\\\v=3i+j\\\\w=i+4j\\[/tex]
[tex]v+w[/tex]
[tex]3i+j+i+4j\\\\4i+5j\\\\u*(v+w)\\\\(5i-j)(4i+5j)\\\\20-5\\\\\boxed{15}[/tex]
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