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DENIUS [597]
3 years ago
9

From 1912 to 1928, the contact number for measles in the U.S. was 12.8. If we assume that Ro is still 12.8 and that inoculation

is 100% effective -- everyone inoculated obtains immunity from the disease -- what fraction of the population must be inoculated to prevent an epidemic?
Social Studies
1 answer:
timofeeve [1]3 years ago
4 0

Answer:

70-85%

Explanation:

Inoculation is basically developing herd immunity in a given population so that there is no more spread of the virus and the pandemic is prevented.

It is generally believed that if 75-80% people are inoculated then epidemic can be prevented.

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Which of the following was permitted by the Articles of Confederation but denied by the United States
velikii [3]

States are denied certain powers under the Articles of Confederation. States may not send ambassadors to foreign countries, receive foreign ambassadors, or make any kind of arrangement, meeting or treaty with any king, prince or state. Not any person or state may accept any gift, including titles of nobility, from a foreign state.

3 0
2 years ago
Which of the following regions did not become part of the Byzantine Empire?
kodGreya [7K]
Thrace because they conquered the other places and took their religions and one of the places they didn't conquered which was therace
5 0
3 years ago
Read 2 more answers
A __________ reinforcer is any reward that naturally increases the frequency of a target behavior.
katrin [286]
I believe the answer is: Primary

For example, let's say take a look at normal employees at a company.

For most of them, the main reason they spend their time to do the job correctly is to obtain money/salary even though they have to spend their time being scolded by unlikable boss.

In the scenario above, we can say that money is the primary reinforcer for the target behavior
5 0
3 years ago
How does specialization encourage trade between countries?
Over [174]
When a country is more specialized, it's able to make something or know how to make something better. If two countries are specialized in different areas, they can each trade their advanced goods instead of each country making moderately good products.
5 0
3 years ago
Why does our country have an army?!
vova2212 [387]
The real reason for maintaining armies is the same reason why some men buy expensive sports cars... overcompensating.

Seriously, think of armies as insurance. Even if it's small, amateurish, and under-funded, it's likely to give potential bullies a little pause. (Of course, a big country like Iraq can sweep up a little country like Kuwait in no time flat, as we all know).

Part of the answer is social/ economic/ political inertia. The military is part of the playground for the elite and privileged. (I use the word playground as in "fork over your lunch money, weakling.") Who wants to get rid of their army just to balance the budget? I sure haven´t seen "fire soldier-boys" on any IMF or World Bank wish lists

A lot of countries, fragile democracies, say, find armies to be an effective tool to use on internal "problems." In a pinch, a loyal military can keep your nation away from chaos. On the other hand, they work equally well to keep dictators in power.

<span>Many countries do get a lot more mileage out of their armies than Iceland or Costa Rica could possibly get. Obviously, a lot of African countries find them pretty handy.
</span>
Also, keep this quote in mind 
<span>"It takes two countries to maintain peace and only one to make war"</span>
5 0
3 years ago
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