SAT Subject Test Mathematics Level 2

14 . B

Plug     and    b   =   t^2     into    the expression:

15 . C

Each    point   is  connected   to  five    other   points  to  make    5   chords  per point.  But this    counts

every   chord   twice—AB    is  indistinguishable   from    BA—so   after   you multiply    6   by  5,  you have    to

divide  by  2,  yielding    15.

16 . B
Take the computers one at a time. Put everything in terms of seconds: t minutes is 60t
seconds and s minutes is 60s seconds.

The new computer    performs     calculations   per second, which   is   calculations   in  t

minutes.    The old computer    performs     calculations   per second, which   is  

calculations    in  t   minutes.

The number  of  calculations    they    perform together    is

17 . D

Try the two given   points  in  the choices.    The point   (−3,0)  satisfies   (B) and (D).    The point   (2,0)

satisfies   (A) and (D).    The only    choice  that    works   both    times   is  (D).

18 . C
You want to rank a, b, and c. Actually, because you’re given three equations, you can solve
for the three unknowns. Subtract the equation b + c = 10 from the equation a + b = 15, and
you get a − c = 5. Now add that to the equation a + c = 13, and you get 2 a = 18, or a = 9. Now