# Tutor profile: Nicole Y.

## Questions

### Subject: Basic Chemistry

Balance the equation: 2CH4 + O2 → CO2 + 2H2O .

Let's go element by element and make sure the amounts of each are the same on both sides of the equation. We see that there are 2 C's and 8 H's on the reactant side. So let's look at the amount of C and H on the other side and make them the same. This would give us 2CO2 and since there are already 4 H's on the product side, we would just need to up the coefficient to 4H2O to get to 8 H's. So now we have the equation 2CH4 + O2 → 2CO2 + 4H2O . Now the last element to count is O. You're going to need to add up the O's on the product side, which is 4 from 2CO2 and 4 from 4H2O, which is 8 total. Since oxygen is a diatomic molecule, we only need to add a 4 as a coefficient to achieve 8 O's on the reactant side. This gives us a balanced equation of 2CH4 + 4O2 → 2CO2 + 4H2O .

### Subject: Biology

What is the main function of the ribosomes?

The ribosome's main function is to translate mRNA into the correct proteins using amino acids corresponding to each codon on the mRNA strand.

### Subject: Algebra

What is the solution to the equation 6x+9 = 3(x-2) ?

Remember PEMDAS! First, you're gonna want to get rid of the parentheses. And how do we do that? Distribute and multiply that number in front of the parentheses with each term in the expression within the parentheses. So in this case, we would multiply 3 with x and with 2 (leave the sign alone!), to make our equation look like 6x+9 = 3x-6 . Next, you want to isolate your variable, which is x! So let's combine the x's and put it all on one side. Let's move the variable to the right side and subtract 3x from 6x to leave us with 3x+9 = -6 . Then we have to subtract 9 from -6 to get the x term isolated, which gives us 3x = -15. All that's left is to divide -15 by 3 to give us x alone, and we find that x = -5 !

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