# Tutor profile: Brittany D.

## Questions

### Subject: Music

Explain the difference between a consonance and dissonance?

All music begins with a key signature. This tells you exactly which notes are sharps or flats within a piece of music. Every eighth note in a scale, which are the seven notes in your key signature, is referred to as a tonic because it's the same note just an octave higher. When notes are played together that give off a "pleasant" noise it is known as consonance. The opposite is known as dissonance. This is a noise where the notes sound as if they don't quite blend well. (Debussy was one of the first composers to use lots of dissonance in his piano compositions.) Generally, notes that are three or five notes up on the keys of a piano have a consonance tone when played together. For example, when middle C is played on piano, If E is played and G is played to now have the root position for a C chord. The C E and G notes all blend together. Conversely, if one was to play a C D and an F you would have a dissonance sound. Although initially you would assume the all music is played aiming to have consonance, much of modern music and classical music are used playing with a dissonance that makes it very unique.

### Subject: Biology

How does the process of osmosis work and what is the significance of this in the human body? Give an example

The basic definition of Osmosis is the spontaneous movement of a molecule in fluid through a semipermeable membrane from a lower concentration to a higher concentration. Most people ask the question "well why is something from a lower concentration moving to a higher concentration? Won't that just make it worse?" At first osmosis seems counterintuitive, but let me explain. Osmosis generally deals with the water molecules moving because they are one of the few molecules that are small enough to move across the plasma membrane. Osmosis occurs in just about every place in the human body. It is a key component to our ability to maintain homeostasis. It is vital to our bodies creating an internal environment that's stable. The most common example of the process of osmosis at work in the body is during dehydration. Many people have a hard time understanding why humans cannot drink salt water if they are stranded on a boat. If you continually drink just salt water, all the salt that is absorbed in the body must be countered. When there is that much salt present, the water is then pulled from the cells in the body to create an isotonic solution. An isotonic solution is where the osmotic pressure is the same on both sides of the membrane making it stable. The two other types of osmotic pressure are hypotonic and hypertonic. Both of these osmotic pressure cause the molecule to move to balance the environment.

### Subject: Algebra

If x = 4, what is y equal to? x + 7 = (y + 9) - x

When you first look at the equation a you want to first notice how many different variables are present. In this case we have an x and a y. The first step in solving this equation is to simplify the expression . For example, on the right side of the equation there is a -x. In order to solve this equation we must add the opposite of the right side x variable to both sides. When solving equations a good motto to remind yourself of is "what is done to one side of the equation, must be done to the other side." This keeps everything balanced and equal. x + 7 = (y + 9) - x +x +x ____________ 2x + 7 = y + 9 This then is your new equation which is much simpler by having only one variable on each side. Our next step is to move the equation around so that we are solving for the variable in question. The question is asking for the y variable, so we need to have the y variable on one side of the equation. Therefore we are going to subtract 9 from both sides of the equation. 2x + 7 = y + 9 -9 -9 ___________ 2x + 16 = y Now you have exactly what y equals. However, many teachers and professor what the most simple version of your variable. This equation can be further reduced by factoring. In the left side of the equation, 2x and 16 are both divisible by 2. Therefore, we can factor out a 2. 2x + 16 = y ----------> 2(x + 8) = y If you were to take that 2 and multiply it back into your equation, you would go right back to your other equation. So, the final answer is... If x = 4, then y is 2(x +8) You can also double check your work by taking what y equals and plugging it back into the equation. x + 7 = [2(x+8) - 9] - x x + 7 = (2x + 16 - 9] - x x + 7 = 2x + 7 - x +x +x _______________ 2x + 7 = 2x + 7 Because your equation reduce down to the same and are equal to each other, you know that your answer is correct!!!! ^.^

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