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# Tutor profile: Audrey C.

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Audrey C.
Student at Columbia University
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## Questions

### Subject:SAT

TutorMe
Question:

A store sells widgets for 6.50\$ and dolls for 2.00\$ each. Total revenue for the day was 836.50\$ and their inventory was depleted by 209 items. How many widgets did they sell?

Inactive
Audrey C.

6.5x + 2y = 836.5 x+y=209, 2x + 2y = 418 4.5x= 418.5 x = 93 widgets x = widgets, y = dolls

### Subject:Chemistry

TutorMe
Question:

Balance the reaction and solve the question: P4(s) + F2(g) --> PF3(g) How many grams of F2 are needed to produce 120g of PF3 if the reaction has a 78.1% yield?

Inactive
Audrey C.

1) Balance the reaction: P4 + 6 F2 --> 4 PF3 2) yield adjustment 78.1% = 120g/x *100 --> x = 153.649g PF3 3) stoichiometric dimensional analysis--> 153.65g PF3 * 1mol PF3/88g PF3* 6mol F2/4PF3 * 38g F2/1mol F2 = 99.5g F2

### Subject:ACT

TutorMe
Question:

I wanted to create not only a question ____ was not only was creative, ____ _____ would be challenging. a. that, but instead b. which, but instead c. that, but also d. that, also which e. which, but also

Inactive
Audrey C.

c. that, but also

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