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Audrey C.
Student at Columbia University
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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?

Audrey C.
Answer:

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

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?

Audrey C.
Answer:

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

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

Audrey C.
Answer:

c. that, but also

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