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Tutor profile: Saurin H.

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Saurin H.
Engineering Student at UCLA — Specializes in Math and Chemistry
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Questions

Subject: Chemistry

TutorMe
Question:

What is the electron pair geometry and molecular geometry of PBr5 (VSEPR)

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Saurin H.
Answer:

First, draw Lewis Dot Structure. I can't really show that here, but PBr5 is a pretty simple structure to draw. First you find that it has 40 valence electrons, then you just start filling them out and it works without any complications. Note: P breaks the octet rule. Once you draw PBr5 you see that there are no lone pairs and the steric number is 5. This means that the electron pair geometry and molecular geometry are the same: they are both trigonal bipyramidal.

Subject: Calculus

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Question:

What is the derivative of f(g(x)) where g(x)=sinx and f(x)=5x^2 - 3x?

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Saurin H.
Answer:

The derivative of f(g(x)) = f'(g(x))*g'(x) f(g(x)) = 5(sinx)^2 - 3sinx --> f'(g(x)) = 10sinxcosx - 3cosx g'(x) = cosx f'(g(x))*g'(x) = 10sinx(cosx)^2 - 3(cosx)^2 = (10sinx-3)*(cosx)^2

Subject: Algebra

TutorMe
Question:

Solve for x, y, and z: (1.) x^2 + 3y - (5/4)z = 8 (2.) 2x^2 - 8y + (3/8)z = 3 (3.) (2/16)z + 7y = 2

Inactive
Saurin H.
Answer:

2*(1.) = 2*(x^2 + 3y - (5/4)z = 8) --> 2x^2 + 6y - (10/4)z = 16 2*(1.) - (2.) --> 0x + 14y - (23/8)z = 13 2*(3.) --> 14y + (2/8)z = 4 [2*(1.) - (2.)] - 2*(3): 0y - (25/8)z = 9 --> (25/8)z=9 --> 25z=72 --> z=2.88 14y + (2/8)(2.88) = 4 --> y=.234 x^2 + 3(.234) - (5/4)(2.88) = 8 --> x=3.301 or -3.301 x=3.301 or -3.301, y=.234, z=2.88

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