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Xinyu L.
Student Tutor from Vanderbilt University
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SAT II Mathematics Level 1
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Question:

A band wants to distribute its music on compact discs (CDs). The equipment to produce the CDs costs 250 dollars, and blank CDs cost 5 dollars and 90 cents for a package of 10. Which of the following represents the total cost, in dollars, to produce CDs, where n is a multiple of 10? (A) (250 plus 0 point 59) times n (B) 250 plus (0 point 59 times n) (C) (250 plus 5 point 90) times n (D) 250 plus (5.90 times n) (E) 250 times n plus 5 point 90

Xinyu L.

each CD: 5.9 / 10 = 0.59 for n CDs: 0.59 n Thus, total cost: 250 + 0.59n choose B

SAT
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Question:

If a/b= 2, what is the value of 4b/a? A) 0 B) 1 C) 2 D) 4

Xinyu L.

b/a = 1/2, 4b/a = 4*(1/2)=2 C.

Pre-Calculus
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Question:

Evaluate limx→2 (3x2+4x+5)

Xinyu L.

limx→2 (3x2+4x+5) =3(2)^2+4(2)+5 =3(4)+8+5 =12+8+5 =25

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