1) How could having more railroad tracks be advantageous during a war?

Railroads provided fresh supplies of arms, men, equipment, horses, and medical supplies on a direct route to where armies were camped. The railroad was also put to use for medical evacuations, transporting wounded soldiers to better medical care.

Explanation:

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°

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