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Caroline S.
Student Tutor at U.Va.
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Spanish
TutorMe
Question:

Conjugate the following irregular verbs in the subjunctive and use them in sentences: ir, ser, saber

Caroline S.
Answer:

ir conjugation: yo vaya, tú vayas, él/ella/Ud. vaya, nosotros vayamos, vosotros vayáis, ellos/ellas/Uds. vayan Example: Espero que tú vayas a la tienda. ser conjugation: yo sea, tú seas, el/ella/Ud. sea, nosotros seamos, vosotros seáis, ellos/ellas/Uds. sean Example: No estoy seguro de que ella sea de Costa Rica. saber conjugation: yo sepa, tú sepas, el/ella/Ud. sepa, nosotros sepamos, vosotros sepáis, ellos/ellas/Uds. sepan Example: Es importante que él sepa las reglas del partido.

Macroeconomics
TutorMe
Question:

In a certain year, the Bureau of Labor Statistics determines the Consumer Price Index (CPI) to be 104.7. The following year, the CPI is found to 108.4. Based on this data, what is the inflation rate from the first year to the second?

Caroline S.
Answer:

The CPI is a ratio that uses weighted averages to determine the change in prices of a basket of consumer goods over time. To determine inflation, we must find the percentage change in the CPI from the first year to the second. To do this, the CPI of the first year is subtracted from the CPI of the second year, then divided by the CPI of the first year and multiplied by 100. 108.4 - 104.7 = 3.7/1 = 0.0353*100 = 3.53%. Inflation was 3.53%, meaning average prices rose by that much over the course of a year.

Basic Chemistry
TutorMe
Question:

When looking at a salad dressing, you can see that the layers of oil and vinegar (which is acetic acid dissolved in water) do not mix. Why does this occur? Include a brief explanation of what is happening at the molecular level.

Caroline S.
Answer:

Oil and vinegar do not mix because oil is a nonpolar substance and vinegar is polar. Nonpolar substances do not have a charge on their molecules, whereas polar substances have partially charged molecules. Because the nonpolar oil is not attracted through charges to the polar vinegar, the two substances do not mix. Remember the phrase "like dissolves like." Nonpolar substances can dissolve and mix with other nonpolar substances, and polar substances can dissolve and mix with other polar substances.

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