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Xinyuan (Christine) Z.
NYU Junior Student
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Basic Math
TutorMe
Question:

48 / 2(9+3)=?

Xinyuan (Christine) Z.
Answer:

The question seems simple but is actually not. The answer is 288, but not 1. It's about order of operations in math.

Mandarin
TutorMe
Question:

__ 他比我大一岁, __ 我的辈分比他大。 a. 不但…而且 b. 虽然…可是 c. 因为…所以 d. 既然…那就

Xinyuan (Christine) Z.
Answer:

The answer should be B. "他比我大一岁" means "he is one year older than me". "我的辈分比他大" means "my position in the family hierarchy is higher than him." There is a transition, so the answer should be, which is "Although...but...".

Calculus
TutorMe
Question:

A jet accelerates along the runway and takes off. It consumes fuel at a rate of f (t) = t2 /(t +1)^3kL per minute. How much fuel does the jet consume in the first 3 minutes?

Xinyuan (Christine) Z.
Answer:

By the Evaluation Theorem, the amount consumed from t=0 to t=3 minutes is 􏰅[integration 0 to 3, t^2/(t+1)^3 dt]. We make the substitution u = t + 1 to make the denominator nicer, then we expand. 􏰅[integration 0 to 3, t^2/(t+1)^3 dt] = ln(4)-32/32=0.355 KL

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