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# Tutor profile: Alyssa S.

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Alyssa S.
Chemical Engineering Graduate Student
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## Questions

### Subject:Chemistry

TutorMe
Question:

Balance the following equation: Cr(OH)3 + HClO4 -> Cr(ClO4)3 + H2O

Inactive
Alyssa S.

Cr(OH)3 + 3HClO4 -> Cr(ClO4)3 + 3H2O

### Subject:Algebra

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Question:

Solve the following system of equations: y + 4x = 8 3x + 2y = 7

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Alyssa S.

y + 4x = 8 3x + 2y = 7 to solve multiply the first equation by -2, this will cancel out the y's when you add the two equations together -2 * (y + 4x = 8) 3x + 2y = 7 -2y + -8x = -16 3x + 2y = 7 Add together -2y + -8x = -16 + 3x + 2y = 7 = -5x = - 9 Solve for x: x= 9/5 using first equation to solve for y y= 8-4x= 8-(4*9/5) y= 40/5 - 36/5 = 4/5 x= 9/5 y = 4/5

### Subject:Physics

TutorMe
Question:

An observation deck of a tall skyscraper is 370 m above the street. If you drop a penny from the observation deck, how long will it take the penny to free fall from the deck to the street below?

Inactive
Alyssa S.

For this we use the equation y = 1/2*a*t^2 + vi*t + yi Where y is the vertical position and yi is the initial vertical position. A is acceleration, and t is time. Since the object is falling the final height is 0 meters, the initial height is 370 m, and the acceleration is gravity or -9.81 m/s^2. Since the object is dropped, the initial velocity is 0. 370 = 1/2(-9.81)t^2 t = sqrt(370/4.9) = 8.69 s t = 8.69 s

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