Which secondary source would the author use to acquire reliable data about da Vinci's employment with Sforza?

The author would use Encyclopedia Britannica as a secondary source to acquire reliable data about da Vinci's employment with Sforza.

Explanation: This is a secondary source because it is evaluating tons of data in order to draw a conclusion about the issue. The source is not performing new research or experimentation but is commenting on existing information out there. Since this issue is regarding a technology that is not yet fully developed and because the research is still new, it is more appropriately covered by a secondary source. As a quality secondary source, it is able to compile myriad factors and studies in order to draw an interpretation or make predictions that might otherwise be impossible to see using only an isolated experiment.

1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)

steps:

1. do 28-12= 16 girls

2. your ratio is 12: 16

3. your answer is b. 3/4

4. this correct because

12 divided by 4 is 3

16 divided by 4 is 4

5. your answer is 3/4