When did the US House of Representatives pass a bill that authorized enlisted men to fly?
a. 1907
b. 1908
c. 1909
d. 1914

It wasn't until July 18, 1914 that the US House of Representatives passed a bill that authorized enlisted men to fly.

begins a massive airlift of food, water, and medicine to the citizens of the besieged city

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°