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Tutor profile: Maya G.

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Maya G.
Engineering Student at Carnegie Mellon University with 4 years of teaching experience
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Questions

Subject: Basic Math

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Question:

A cube has a side length of 5 cm. A sphere has the same diameter as the side length of the cube. Find the volume of both the cube and the sphere. Which one is larger? By how much?

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Maya G.
Answer:

Volume of cube: (SL)^3=Volume (5^3)=125 cm^3 Volume of sphere: (4/3)*pi*r^3 = volume diameter = 5 cm radius=diameter/2 = 5/2= 2.5 cm (4/3)*pi*(2.5^3) = 65.4 cm^3 = (125*pi)/6 cm^3 Cube has larger volume. 125-65.4= 59.6 cm^3

Subject: Biology

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Question:

What are the 4 steps of cellular respiration? How many ATP are produced from each step? What is the total ATP production of cellular respiration?

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Maya G.
Answer:

The 4 steps are as follows: 1. Glycolysis: Happens in the cytoplasm- one glucose molecule is broken down into 2 pyruvate molecules. 2 ATP produced per glucose molecule. 2. Transition reaction: Pyruvate is moved into the mitochondria where it is turned into Acetyl CoA 3.Krebs Cycle: Happens in the mitochondrial matrix. With the presence of Oxygen gas (O2), all the hydrogens (H2) are stripped off the Acetyl CoA, to extract the electrons for making ATP, until there are no hydrogens left. The waste products of this are CO2 and H2O. Produces about 4 ATP but a lot of NADH which is important for the last step. 4. The Electron Transport Chain (ETC): occurs in the christae of the mitochondria. Electrons are carried down the chain with the help of NADH. ATP synthase turns ADP to ATP, which results in 32 ATP per glucose molecule. Total ATP produced = 38.

Subject: Calculus

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Question:

Find the 'area under the curve' for the following equation from x=0 to x=5: f'(x) = (x^4)+(4x^3) - 2

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Maya G.
Answer:

To find the area under the curve, we need to take the integral of f(x) using the bounds given to us in the problem (0,5). We can use the Power Rule to integrate: f(x)=(x^5/5)+(x^4)-(2x) We must then evaluate f(x) from 0 to 5 meaning our answer will be f(5)-f(0) f(5) = (5^5/5)+(5^4)-(2*5) = 625+625-10 = 1240 f(0)=0 f(5)-f(0)=1240 Our answer is 1240.

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