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# John Z.

## Chemistry, Physics, SAT Math, and Calculus Tutor; CU Chemical Engineer

### Brooklyn, NY (11209)

Hourly fee \$150.00
 Background check passed as of 2/21/13 You don't pay for tutoring unless you find a good fit! You don't pay for tutoringunless you find a good fit!

# How would you simplify this:(x + 3y - 5z) - (x - 2y + 6z)I need assistance on solving (answer)

By the order of operations, multiplication comes before addition. The (x-2y+6z) is being mulitplied by -1, so distribute that through first. Then remember that addition is commutative and you can add/subtract like terms together, for example  3y + 4y = 7y.

# Identify the solution(s) of the system of equations, if any. 2x+5y=10 and y=2-x (answer)

This is a classic two equations with two unknowns type problem.  The goal in the first step is to eliminate one of the variables by making an equivalent statement in terms of one variable. In order to get rid of one of the variables, substitute either y = 2-x    or ...

# One leg of a right triangle has a length of 7 centimeters. The other sides have lengths that are consecutive integers.find these lengths. (answer)

You know by the Pythagorean theorem that a2 +b2 = c2 where a and b are the legs of the triangle and c is the hypotenuse or longest side. When they say the other two legs are consecutive integers, that means that x = x+1 or in this case c = b+1. By substituting c = b+1 and 7cm...

# Blog

What's happening in the world of private tutoring?

## The World's Balancing Act

If you let processes that can go both forwards and backwards sit long enough, they will reach “dynamic equilibrium.” This sounds like an oxymoron because things at equilibrium are constant, right? Well, molecules are always spontaneously bumping into each other and exchanging energy. What we perceive as stuff moving in one direction just means that the rate of stuff in that direction is greater... read more

## Pendulums

WyzAnt asked me to write a summary of pendulums for their self help section. It includes frequencies, amplitudes, and periods of pendulums, conservation of energy, forces on a pendulum, and motion of objects experiencing Simple Harmonic Motion. It can be found here: http://www.wyzant.com/help/science/physics/pendulums Most systems do not even reach their equilibrium conditions let alone... read more

### John's Hourly Rate

Hourly Fee: \$150.00

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### Background Check Status for John Z.

John Z. passed a background check on 2/21/13. The check was ordered by John through First Advantage. For more information, please review the background check information page.

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