# Tutor profile: Tesiya F.

## Questions

### Subject: Basic Math

Subtract 2/3 from 3/4.

Find the common denominator for each fraction. -The least common multiple (LCM) for 3 and 4 is 12. Change the denominator of each fraction to 12 while keeping the value of the fraction the same. 2/3 x 4/4 = 8/12 3/4 x 3/3 = 9/12 Now subtract the fractions. 3/4 - 2/3 = 9/12 - 8/12 = 1/12 3/4 - 2/3 = 1/12

### Subject: Basic Chemistry

Which of the following molecules would have the highest vapor pressure? CH3CH3 , CH3CH2OH , CH3-O-CH3

Vapor pressure is defined as the pressure exerted by the vapor molecules above a liquid ie. how likely the liquid molecules are to break free from the liquid's surface and become vapor molecules. The molecule with the highest vapor pressure would be the molecule with the weakest intermolecular forces because the forces would not be strong enough to keep the liquid molecules from escaping. CH3CH3 molecules are held together only by London dispersion forces, the weakest type of intermolecular forces, because it is a nonpolar molecule and has no net dipole movement, CH3CH2OH molecules are held together by hydrogen bonds, strongest intermolecular forces, because they have OH bonds which bond strongly to each other. CH3-O-CH3 molecules are held together by dipole-dipole movements, which are stronger than London dispersion forces but weaker than hydrogen bonding, because it is a polar molecule. CH3CH3 would have the highest vapor pressure because it has the weakest intermolecular forces.

### Subject: ACT

A small electronics store made $500,000 more its second year in business than it did the first year. The third year, the store made double what it made the second year. If the store made $2 million in sales the third year, how much did it make the first year in business?

Let "y" equal the sales in the second year. The store made double the amount the third year than the second year, so... 2y = $2,000,000 y = $1,000,000 (The store made $1,000,000 in its second year.) Let "x" equal the sales in the first year. The store made $500,000 more in the second year than the first, so... x + $500,000 = $1,000,000 x = $500,000 ***The store made $500,000 in its first year of business.***

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