What did the Union Army do to northwestern and central Louisiana after the Red River campaign? They destroyed towns and plantations and stole property as they retreated.

They damaged Louisiana towns and plantations considerably, but private property remained due to Union war policies.

They destroyed plantations with fires, but entire towns were left because they hoped to recapture them for later use.

They were minimally invasive, but inflicted damage on roads and bridges.

A.

Explanation:

They destroyed towns and plantations and stole property as they retreated.

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°