What is the significance of spanish flu

In 1918, a new influenza virus emerged to cause a pandemic that in a two-year period about 500 million people or one-third of the world's population became infected with this virus and at least 50 million people worldwide died the greatest influenza mortality in recorded history

Explanation:

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the chinese communist party (ccp);

explanation:

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69