Why did Harriet Tubman first became involved with the Underground Railroad

Tubman first encountered the Underground Railroad when she used it to escape slavery herself in 1849. Following a bout of illness and the death of her owner, Tubman decided to escape slavery in Maryland for Philadelphia.

Explanation:

c) troops march forward in close formation against newer, more accurate weapons

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation: