Which sentence has a formal style and tone?
a) it ain't necessarily true that people who are good at geometry often turn into engineers.
b) see, the problem is, you guys just don't know what is causing the water shortage in this city.
c) y'all need to study much with much more diligence, if y'all are going to do well on this next test.
d) scientists have spent years trying to determine how tsunamis can be predicted with greater accuracy.

I think it is D.) Scientist have spent years trying to determine how tsunamis can be predicted with greater accuracy.

Explanation:

Words like ain't, you guys, or y'all would not be worlds you would want to put in a formal style or tone.

So, words such as determine, predicted, and greater accuracy, are formal in a way. Just think of it this way, the sentence would sound as if someone who was smart was speaking or someone who is very FORMAL.

I hope this helped you ; )

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)