# Tutor profile: Eeman K.

## Questions

### Subject: Basic Chemistry

Electron configuration changes for elements based on the number of electrons surrounds the nucleus. What is the electron configuration for Carbon, C+, and C- and what do these mean?

Carbon in its neutral form has a total of 6 electrons. Four are in the s orbital and 2 are in the p orbital which results in a configuration of 1s2 2s2 2p2. C+ implies that there is a loss of an electron so this carbon has 5 electrons giving it a configuration of 1s2 2s2 2p2. C- implies that there is a gain of an electron so this carbon has 7 electrons giving it a configuration of 1s2 2s2 2p3.

### Subject: Biology

Explain sex-linked traits, what are they, how do they happen, and what are some examples?

A sex-linked trait is a trait that passes along the X chromosome. Females have XX and males have XY chromosomes. Due to the size of the Y chromosome, there is not enough space for genetic material. For this reason, these traits are on the X chromosome and disproportionately affect males as they do not have another X to compensate for an unfavorable gene. Examples of disorders caused by sex-linked traits are red-green colorblindness and calico coloring in cats.

### Subject: Algebra

2x + 3y = 15 x - 3y = 3 X= ? Y=?

When solving systems of equations there are three main solutions. There are graphing, substitution, and elimination. Personally, for me, I like elimination best as it means you have to focus on only one variable at a time. When doing elimination, we have to have one variable cancel out completely. In this case, the "y" variable looks easiest. In order to solve this equation lets eliminate the "y" variable as shown below: (2x + x) + (3y - 3y) = 18 3x = 18 3x/3 = 18/3 x=6 Next, lets plug the x-value back into an equation. The second looks easier. Let us solve as shown below. 6 - 3y = 3 6 - 3y - 6 = 3 - 6 -3y = -3 -3y/-3 = -3/-3 y = 1

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